Simplify the following text for a Grade 8 native English-speaking person.
Original: The ambush party , commanded by Liam Deasy , had mostly dispersed to a nearby pub by 8:00 p.m. , when Collins and his men returned to BÃ al na mBlath but the remaining five ambushers on the scene opened fire on Collins ' convoy .
Simplified: The ambush party , commanded by Liam Deasy , opened fire on Collins ' convoy .