Some friends did a "blackhawk Down" senario with a squad of Space Marine scouts vs Kroot, a downed speeder, meat grinder kroot coming in from randon table edges. and random fly bys by Imperial flyers. Marines had to make it off a short table edge with no less than 1/2 the squad. Scouts could use 3 smoke grandes for a 5+ cover save. Kroot had 4 squads on the board edges at turn 1 with a new squad every turn or they could get a Krootox.
It wasnt pretty... but it was frantic.