sentences:  The Bulgarians formed an opposing battle row, echeloned in squadrons of four in a rear column, at 6,000 m. The wing had the task to engage the enemy P-38 Lightning fighters while at the same time the other wing, 2/6, would hit the bombers and force them to release their bombs outside the city.Flying Officer Spisarevski's aircraft failed to start and he took off in a reserve plane with some delay in what would be his first and only aerial battle.When he reached the bombers, the battle had already begun.