To survive: Stick yourself in cover. If you need to advance, then do so going from cover to cover. If enemy needs LOS to shoot at you, deny LOS with terrains....or a landed devilfish. Spread your men so that they are 2" away from each other... in a line, if you want the least casualty... Other than that, just pray, and throw those cover save dice.
Or you could simply eliminate the big bad tank shooting at you.