Get to the Tilsson | Composer Halo 4 Guide
Last update: 11 May 2016
Door on right opens (new cannon should also show up). Behind them you'll see enemies - kill them. Go inside and finish off rest of them. when it's done, take the cannon.
Get to the next room and with a group of marines go upstairs on the highest floor. When you kill enemies go through door on left.
You get to a room with two Hunters. In the same room, on right, you find a small office, where you can find a bit of weapons (including ammo to sticky detonator). The weapon is on a stand, left of the office. As usually, try to attack enemies from the back. If you have a Hologram module use it to distract enemies.
If enemies group in the middle of a room, it'll be easier for you to hide behind barriers and avoid shots.