Won my first crusade game in the campaign after 4 losses, the mission was Against the Swarm where the attacker aka me destroys objectives as an action, once per turn. I just swarmed the board with multiple units and managed to destroy three to get me to 45VP vs my opponent's 20. I killed only one unit in total which wasn't even necessary and only one of my units survived out of 10 but it did not matter. Genestealers also having infiltrator allowed me to destroy the centre objective in turn 1 which was nice.