The following is the Bulgarian Order of Battle at the start of the Second Balkan War as of 29 June [O.S. 16 June] 1913. This order of battle includes all combat units, including engineer and artillery units, but not medical, supply, signal, border guard and garrison units.
During First Balkan War Bulgaria mobilized 599,878 men out of a total male population of 1,914,160. Final victory over the Ottoman Empire however came at the cost of some 33,000 killed and 50,000 wounded soldiers while many others were affected by the spread of cholera and dysentery. With the end of the war the relations between the members of the Balkan League deteriorated rapidly due to the unresolved problem of the division of the conquered lands which forced Bulgaria to transfer its armies from Thrace to Macedonia.
On the eve of the outbreak of the Second Balkan War the field forces of the Bulgarian Army were deployed in five armies along a 500 kilometer front from the Danube to the Aegean Sea. Despite all the measures taken by the military authorities, including the drafting of young Bulgarian men aged 20–26 years living in the newly occupied territories in Thrace and Macedonia, the number of mobilized personnel reached a total of 500,491 men. Thus for the war against its former allies Bulgaria could rely on manpower that was about 83% of the one available during the First Balkan War.
The Bulgarian command deployed five field armies against Serbia and Greece while it kept minimal forces near the Ottoman border and no forces at all on the Romanian border. Besides the 11 infantry division, 1 cavalry division and the Macedonian-Adrianopolitan Volunteer Corps the high command also raised two additional infantry divisions(12th and 13th) and one independent infantry brigade. Many of the old divisions however had at least one of their infantry brigades taken away and attached to the field armies as independent units which created logistical difficulties. Thus it seemed the Bulgarian GHQ was attempting to provide greater numbers of available units while disregarding the quality of some of those units. As a result, the total strength of the field forces was increased to around 297 infantry battalions, 47 cavalry squadrons and 186 artillery batteries.
The material situation of the armed forces was improved compared to the first war. The number of available horses was increased by 12,594 to 97,456 while the number of rifles increased by 44,561 to 378,996 and artillery guns by 112 to 1228. Still according to the mobilization plans of the General Staff the army was supposed to have 483,674 rifles and 117,733 which showed that, like the manpower deficit, the material shortages had not been dealt with by the time the war began.
The nominal commander in chief of the Bulgarian Army was Tsar Ferdinand I but de facto its control and leadership were initially in the hands of his deputy Lieutenant-General Mihail Savov. The Chief of the General Staff Major-General Ivan Fichev opposed the war and was officially in resignation, though de facto he was never dismissed, while his functions were carried out by the Deputy Chief of Staff Colonel Stefan Nerezov . Other notable changes in the command structure took place almost immediately after the outbreak of the war when General Savov was fired as deputy of the commander-in-chief, although he latter returned to take command of the combined 5th, 4th and 2nd armies. Ferdinand chose the Russophile General Dimitriev as his deputy while General Racho Petrov assumed command of the 3rd Army.
First Army was commanded by Lieutenant-General Vasil Kutinchev.
5th Danube Infantry Division
1st Brigade
2nd "Iskar" Infantry Regiment
5th "Danube" Infantry Regiment
2nd Brigade
18th "Etarski" Infantry Regiment
20th "Dobruja" Infantry Regiment
1st QF FAR
1st FAR
5th Pioneer Battalion
9th Pleven Infantry Division
1st Brigade
4th "Pleven" Infantry Regiment
17th "Dorostol" Infantry Regiment
2nd Brigade
33rd "Svishtov" Infantry Regiment
34th "Troyan" Infantry Regiment
9th QF FAR
9th Pioneer Battalion
Independent Infantry Brigade
65th Infantry Regiment
66th Infantry Regiment
1/8 Artillery Section
Army Troops
two cavalry squadrons
Third Army was commanded by Lieutenant-General Radko Dimitriev.
1st Sofia Infantry Division
1st Brigade Colonel
1st "Sofia" Infantry Regiment
6th "Turnovo" Infantry Regiment
2nd Brigade (Major-General
37th Infantry Regiment
38th Infantry Regiment
4th QF FAR
4th FAR
1st Pioneer Battalion
13th Infantry Division
62nd Infantry Regiment
63rd Infantry Regiment
64th Infantry Regiment
13th FAR
3/5 Infantry Brigade
45th Infantry Regiment
46th Infantry Regiment
1/1 Artillery Section
Cavalry Division
1st Brigade
1st Cavalry Regiment
Leib Guard Cavalry Regiment
2nd Brigade
2nd Cavalry Regiment
7th Cavalry Regiment
5/5 Artillery Battery
Army Troops
3rd Cavalry Regiment
Army Artillery
Fifth Army was commanded by Major-General Stefan Toshev.
4th Preslav Infantry Division
1st Brigade
7th "Preslav" Infantry Regiment
19th "Shumen" Infantry Regiment
3rd Brigade
43rd Infantry Regiment
44th Infantry Regiment
5th QF FAR
5th FAR
4th Pioneer Battalion
12th Infantry Division
59th Infantry Regiment
60th Infantry Regiment
61st Infantry Regiment
12th FAR
Odrin Brigade
71st Infantry Regiment
72nd Infantry Regiment
2/10 Artillery Section
Army Troops
6th Cavalry Regiment
Army Artillery
Fourth Army was commanded by Major-General Stiliyan Kovachev.
2nd Thracian Infantry Division
1st Brigade
9th "Plovdiv" Infantry Regiment
21st "Srednogorian" Infantry Regiment
2nd Brigade
28th "Stremski" Infantry Regiment
27th "Chepinski" Infantry Regiment
3rd Brigade
39th Infantry Regiment
40th Infantry Regiment
3rd QF FAR
3rd MAR
2nd Pioneer Battalion
7th Rila Infantry Division
1st Brigade
13th "Rila" Infantry Regiment
28th "Pernik" Infantry Regiment
2nd Brigade
14th "Macedonian" Infantry Regiment
22nd "Thracian" Infantry Regiment
3rd Brigade
49th Infantry Regiment
50th Infantry Regiment
7th QF FAR
9th FAR
1/2 Mountain Artillery Section
7th Pioneer Battalion
8th Tundzha Infantry Division
1st Brigade
12th "Balkan" Infantry Regiment
23rd "Shipka" Infantry Regiment
2nd Brigade
10th "Rhodope" Infantry Regiment
30th "Sheinovo" Infantry Regiment
3rd Brigade
51st Infantry Regiment
52nd Infantry Regiment
8th FAR
2/1 Artillery Section
8th Pioneer Battalion
1/3 Infantry Brigade
1st "Sofia" Infantry Regiment
6th "Turnovo" Infantry Regiment
1/6 Artillery Section
2/4 Infantry Brigade
8th "Primorski" Infantry Regiment
31st "Varna" Infantry Regiment
2/5 Artillery Section
Macedonian-Adrianopolitan Volunteer Corps
1st Brigade
1st "Debar" Infantry Battalion
2nd "Skopie" Infantry Battalion
3rd "Solun" Infantry Battalion
4th "Bitolia" Infantry Battalion
13th "Kukush" Infantry Battalion
2nd Brigade
5th "Odrin" Infantry Battalion
6th "Ohrid" Infantry Battalion
7th "Kumanovo" Infantry Battalion
8th "Kostur" Infantry Battalion
14th "Voden" Infantry Battalion
3rd Brigade
9th "Veles" Infantry Battalion
10th "Prilep" Infantry Battalion
11th "Serres" Infantry Battalion
12th "Lozengrad" Infantry Battalion
15th "Shtip " Infantry Battalion
2/8 Artillery Section
2/2 QF Mountain Artillery Section
3/2 QF Mountain Artillery Section
4/2 Mountain Artillery Section
Army Troops
5th Cavalry Regiment
7th Opalchenie Regiment
Second Army was commanded by Lieutenant-General Nikola Ivanov.
3rd Balkan Infantry Division
2nd Brigade
29th "Yambol" Infantry Regiment
32nd "Zagora" Infantry Regiment
3rd Brigade
41st Infantry Regiment
42nd Infantry Regiment
6th QF FAR
6th FAR
3rd Pioneer Battalion
11th Infantry Division
55th Infantry Regiment
56th Infantry Regiment
57th Infantry Regiment
11th FAR
1/10 Infantry Brigade
16th "Lovech" Infantry Regiment
25th "Dragoman" Infantry Regiment
3/10 Artillery Section
Serres Infantry Brigade
67th Infantry Regiment
68th Infantry Regiment
1/1 Artillery Section
Drama Infantry Brigade
69th Infantry Regiment
70th Infantry Regiment
2/7 Artillery Section
Army Troops
7th Replacement Infantry Regiment
10th Cavalry Regiment
5th Border Guards Battalion
1st, 3rd, 5th, 6th, 7th, 8th, 10th Replacement Cavalry Squadrons
2/8 QF Howitzer Section
Reserve of the High Command
6th Bdin Infantry Division
1st Brigade
3rd "Bdin" Infantry Regiment
15th "Lom" Infantry Regiment
2nd Brigade
35th "Vratsa" Infantry Regiment
36th "Kozloduy" Infantry Regiment
2nd QF FAR
6th Pioneer Battalion
2/10 Infantry Brigade
47th Infantry Regiment
48th Infantry Regiment
two cavalry squadrons
1/2 Artillery Section
9th Cavalry Regiment
8th Cavalry Regiment
58th Infantry Regiment