1st Serbian Army - 105,000 men with 145 guns 3rd Serbian Army - 70,000 men with 97 guns Montenegrin Division - 10,000 men and 6,000 volunteers from the Volunteer Brigade 4th Bulgarian Army - 116,000 men with 210 guns 5th Bulgarian Army - 68,000 men with 118 guns The Battle of Bregalnica was fought between the armies of the Kingdom of Bulgaria and the Kingdom of Serbia during the Second Balkan War from 30 June to 8 July.

[3] It was the largest battle of the war.

[4]