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Onslaught is the first mission available in
SAS: Zombie Assault 4
, taking place in the Kurios Space Station.
A dropship in an infested space station cannot depart because its door ramps are stuck. The ramps will be repaired in 6 1/2 minutes, but until then, the player(s) must fight off the incoming horde of zombies.
It is a dropship with a door ramp on the right, a large room with boxes in the middle, and side passageways on the top and bottom of the central room. It's one of the smallest maps, so be careful of being swarmed or cornered by zombies. However, in terms of being a boss fighting area, it is actually larger, with more maneuverable obstacles to block the boss' movement compared to Survivors.
At the 1:45 mark (or 2:30 mark on level 2+), the pilot will drop 2 loot drops on each passageway of the map, just outside the central room
After At the 0:43 minute mark (1:00 mark on level 2+), the pilot will open the door to the forward jump seats where there's a loot drop and a medkit.
Between the 2 barricades the player must defend, there's a black area which can be opened by shooting at it from the right, which will reveal a loot drop medikt.
TACTICS:
https://youtu.be/2cuNeikYOEM
At low levels, try double-blocking both entrances with boxes because it's very likely that the barricades will fall. When the boss comes, fall back to the center area and move around the boxes, making the boss chase you in a circle. If there are too many weaker zombies, shoot the explosive barrels to kill them. Fall back to the forward jump seats if you need to. If the tall, darker boxes in the center room ever get in the way of you shooting the boss, you can shoot them to destroy them, since they'll just get in the way.
Multiplayer
Unlike singleplayer, where you work alone to strategize, you will have to cooperate with multiple people to achieve victory.
When either of the ramp doors fall, do not rush to the center stash between the ramp doors alone. Have your team coordinate when to break into that stash as a single player will most likely get overrun by the stepped up zombies.
Similar to singleplayer, an effective start is to block both ramp doors but a faster, more supply consuming tactic is for all players except one to block the door with crates while turrets and the remaining player defend them.
At higher levels, it is simple for players to split into two teams, one in charge of each door and entirely prevent zombies from reaching the doors. So long as reloads are spaced decently well, zombies can be prevented from damaging the door altogether. When the boss comes, it will quickly destroy even full health doors however and a tactic of running around the ship is fast and cheap on ammo.