Half-Life 2 Source Forts Trenches Map

In this map I attempted to make the feel of a World War I style battle. Each team has a base trench, where they have a warehouse.
In each warehouse there are entity spawners. To activate the entity spawners, press the USE key, and a block should appear. There is a limit of 70 on each spawner to limit spamming. Each team also has a supply trench, which contains ammo crates and h