Our main strategy was to stay in the hallway where the ammo spawns (in front of the room where the shield spawns).  Every wave we grabbed the shield that spawned and placed it in the doorway at the end of the hallway.  At the end of every wave 2 or 3 players would reset the shields.  One or two players would run for grenades in the halls on the side of the map.  The last player would run for the mulcher in the gazebo.  We would all take turns grabbing the ammo box as soon as it spawned to make sure we all had max ammo at all times.

We shot over the shields on both ends of the hall to keep the horde back.  When the horde got past the shields we would all focus on the side that was breached, eventually falling back in the shield room and defending the small hallway to that room.

We were all beaten at wave 40 and restarted at that level.  We did not have any shields.  We kept trying to defend the shield room, but the bloodmounts were too fast and that room was too small to beat wave 40.  Finally we tried a different strategy which was to go to the lowest part of the map (down the stairs on either side of the gazebo).  From there we spread out so it was harder for the bloodmounts to take us all out.  There is a small corridor between the two sides on the lower part of the map where the mortar spawns. We made sure to grab the mortar whenever it was available and kept firing rounds at the stairs to the lower areas (whether we saw an enemy or not). If a bloodmount did make it to the lower area, we would run through the corridor to the other side and fire back through the corridor at the bloodmounts who had a harder time making it through the narrow corridor.

We had to try that strategy a few times before beating wave 40. Once we beat that wave, we went back to our original strategy of defending the hall and we were able to do that without much trouble once we have a few waves to get our shield defenses built back up.

I must admit not everyone I was playing with knew about this strategy, but it has been working.  When a bloodmount attacks the newbs try to go toe-to-toe with the bloodmount.  This is bad for them, but good for you.  This allows the rest of the team to fall back.  Everyone needs to shoot at the bloodmount (in the head!  always in the head!) and ignore the rider until the bloodmount is dead.  The newb might get knocked down before you kill the bloodmount, but the bloodmount will usually leave that player and come after the rest of the team (at least in the earlier waves 10, 20, 30).  By that time the bloodmount is pretty much ready to die and only makes it a few steps before it is downed.  Right when the bloodmount is ready to die, or when it dies, the rider falls off and it stunned for a little bit.  Use this time to run up on the rider and saw him down.  This saves your ammo to use on the next bloodmount.  One person can be sawing down the rider while the others revive the downed teammate.  Since you can only go down three times before you die, you might have to take turns going toe-to-toe with the bloodmounts.

I only recommend this strategy if you don’t have shields.  Also make sure you have plenty of room to back away from the bloodmount.  This strategy doesn’t work well if you can only back up a couple steps.  You need to have plenty of distance between you, the newb and the bloodmount.  You also need a team that works together to bring down the bloodmount by shooting it in the head.  If the newb can stand in a doorway while fighting the bloodmount toe-to-toe it also prevents other enemies from making it past them so you only have to fight one at a time.

- Do not count on sandbags or short walls to stop a bloodmount, they can jump over them.
- Bloodmounts cannot jump over a planted shield so make sure you have plenty of them.
- Always aim for the rider first. If he is dismounted he can kick your shield down to let the bloodmount through. Then your dead.
- Always aim for humanoid locust before shooting a bloodmount because they can knock down your shields.
- When your team is shooting, have everyone shoot at the same bloodmount rider and kill all the riders one by one before the bloodmounts themselves. The riders can shoot over your shields so take them out ASAP.
- Let tickers get next to bloodmounts before shooting them. Their explosion damages the bloodmounts (or any other enemy).
- Flame boomers cannot kick down a shield but flamers can. Shoot down flamers before they get to your shields, but let flame boomers get next to the shields by the bloodmounts before shooting their tanks. They explode like tickers once thier tank starts spewing fire.
- Holding shields a few steps behind shields planted in doorways is a good way of protecting yourself. Magnums and gorgons can take out the riders easily. People not holding shields can stand behind the shield holders with shotguns, lancers or hammerbursts to take out the riders.
- Once you take out a rider, leave the bloodmount until all other riders or humanoid type locusts are dead (assuming you have shields planted to keep them out).
- Bloodmounts only come out in waves 10, 20, 30, 40, 50.
- Make sure to get ammo at the end of wave 9, 19, 29, 39, 49.
- Never run for ammo in wave 10, 20, 30… you won’t make it back 90% of the time.
- Never run to save a teammate in wave 10, 20, 30… let them try to make it back to safety where you can revive them, otherwise you won’t make it back 90% of the time.
- Grenades, sniper rifles, mortars and the hammer of dawn are difficult to use against a bloodmount because they move so fast.
- Don’t waste ammo on bloodmounts when they are far away, let them come up to your shields before firing. You’ll need all of your ammo.