Who ordered the bombers to attack the dreadnaught at the beginning of Star Wars: The Last Jedi? Was it Leia or Poe?
Poe says . . .
"All Clear. Bring the bombs!"
. . . at which point the bombers start their attack run.
It's not entirely clear what his standing order from Leia were, other than to keep the dreadnought occupied while their transports left the surface.
As I've noted in another answer, Commander Poe appears to be the only one who can issue orders to his squadron (or else Leia would simply order them to withdraw) which means that the responsibility for sending them into battle, in violation of Leia's clear orders, rests solely and firmly with him.