Fort Stonewolf is a map that is based around keeping attackers out of the Fortress if you are defending, and capturing the flag that is inside if you are attacking. This map also uses the weapon fusion glitch, allowing me to create a sort of crossbow. (using a plasma caster and a railgun.)
Attackers must first find a way to open the gate to the Fort while avoiding crossbow fire and bombs from the defenders, who can close the gate at will. Once inside, there is a way to keep the door from closing. There is also a prison on the inside of the Fortress with one initial spawn point for attackers in a cell, so 1 out of 4 players will initially spawn in here, while the others must release him so he can respawn normally. Finally, the attackers must climb the scaffolds to the top of the high wall, ultimately reaching the flag.
Aside from the crossbows and swords, attackers get a Corpsemaker which spawns every 2 minutes. Defenders get 2 grenades every 1 minute, but you can only hold one. Grenades will do massive damage with a big blast radius, but they are heavy and are thrown slowly.
In summary, the attackers are at a noticeable disadvantage, but once attackers overcome the obstacles holding them back, the playing field evens out. Supports 4v4 players. Uses the custom game mode in my bookmarks, "Siege on Stonewolf"