The British reinforcements had just arrived in the Balkan Peninsula and had not yet taken over the entire defense zone when the Bulgarian Guerrilla Team launched a comprehensive counterattack. The Russians were also very cooperative, tightly suppressing the Allied Forces at the front line.
It proved that Plovdiv was indeed a bait set by the British, intending to surround and annihilate the main force of the Bulgarian Guerrilla Team there, but they managed to control the beginning, not the end.
The battle had just started when the situation changed; more than a dozen cities, including Plovdiv, were simultaneously attacked by the guerrilla team.
Most of these were feints, but this chaotic assault exposed the British defenses, which were still incomplete.