of Thessaly (Στρατιά Θεσσαλίας), with three army corps and seven infantry divisions, with a total fore of about 100,000 men, 25,000 animals, and 3,500 vehicles the Army of Epirus (Στρατιά Ηπείρου), with an ad hoc assemblage of five infantry regiments and other units, with a total force of 13,000 men, 4,200 animals and 400 vehicles the rear area army, or Army of the Interior (Στρατός Εσωτερικού), with 17,000 men, 2,900 animals, and 1,800 vehicles In contrast to pre-war planning, no army corps were established; instead, the divisions were directly subordinated to GHQ of the Army of Thessaly. The latter, which comprised the bulk of the Greek Army, was placed under the command of the Crown Prince and gathered around Larissa, while the Army of Epirus formed around Arta under Lieutenant General Konstantinos Sapountzakis. After the Ottoman government rejected an ultimatum of the Balkan states, Serbia and Bulgaria declared war on , with Greece following the next day. Army of Thessaly, 18 October 1912 The Army of Thessaly comprised in total 59 infantry and 4 Evzone battalions, eight cavalry companies (of the Cavalry Brigade) and six half-companies (organic to the infantry divisions), seven engineer companies (organic to the infantry divisions), 32 artillery batteries with 96 field guns, 24 mountain guns and 54 fortress guns and 70 machine-guns, and various support troops including an aviation company with four aircraft. The force totalled some 100,000 men, with front-line effectives. On these were organized in the following formations: 1st Infantry Division (Ι Μεραρχία), under Maj Gen Emmanouil Manousogiannakis, at Ampelonas 2nd Infantry Regiment 4th Infantry Regiment 5th Infantry Regiment 1st and 2nd squadrons of the 1st Field Artillery Regiment 2nd Infantry Division (II Μεραρχία), under Maj Gen Konstantinos Kallaris, at Tyrnavos 1st Infantry Regiment 3rd Infantry Regiment 7th Infantry Regiment 1st and 2nd squadrons of the 2nd Field Artillery Regiment 3rd Infantry Division (III Μεραρχία), under Maj Gen Konstantinos Damianos, west of Larissa 6th Infantry Regiment 10th Infantry Regiment 12th Infantry Regiment 1st and 2nd squadrons of the 3rd Field Artillery Regiment 3rd Mountain Artillery Squadron 4th Infantry Division (IV Μεραρχία), under Maj Gen Konstantinos Moschopoulos, at Petrino 8th Infantry Regiment 9th Infantry Regiment 11th Infantry Regiment 1st and 2nd squadrons of the 4th Field Artillery Regiment 1st Mountain Artillery Squadron 5th Infantry Division (V Μεραρχία), under Col Dimitrios Matthaiopoulos, at Krannonas 16th Infantry Regiment 22nd Infantry Regiment 23rd Infantry Regiment 3rd Squadron of