Gallipoli Expedition Best Classes and Roles for Attackers

Keep Momentum high while taking and securing sectors. Every attacker death costs 1 Momentum. The attack lives or dies on how far forward you push squad beacons and how few lives you waste. Here is the class combination that actually finishes sectors before Momentum runs out.

Gallipoli Expedition Mode Officer + Engineer core 1 death = 1 Momentum
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Core goal: Keep Momentum high while taking and securing sectors. Every attacker death costs 1 Momentum. You must capture the HQ, then immediately build 3 structures on it (or destroy the required objects) before the next sector unlocks. Support objectives give extra Momentum, a forward spawn, and weapons. The attack lives or dies on how far forward you push squad beacons and how few lives you waste doing it.

1Class Breakdown: What Each Role Does

Officer (start of every sector)
Push forward, whistle, call creeping barrage
Officers let squadmates spawn on you and can whistle to rally. Push up immediately so people spawn closer instead of running the full distance from the original spawn. Call creeping barrage (Assault squad type) when you are about to cross open ground. It creates dust clouds you can move through. There is no creeping smoke like Isonzo.
Engineer (switch kits by phase)
Saboteur while moving, Frontline Builder after HQ cap
Saboteur kit ("Search and Destroy"): pistol plus water bottle for stamina plus passive equipment spotting. Use this while the fight is still moving. You stay light and can find and destroy enemy gear.

Frontline Builder kit: rifles plus sandbags plus wire. Switch to this the second the HQ is captured. Multiple Engineers stacking on the same structure finish the three required builds much faster. Protect them with Riflemen, Bombers, and an HMG.
Bomber (every trench push)
Extra grenades, stun resistance, room clearing
Extra grenades clear rooms and suppress. One kit is faster with more grenades but melee-only. The other lets you carry two grenade types. They resist stun from enemy grenades, so they can keep throwing while everyone else is flinching.
Stretcher Bearer (right behind the lead element)
Faster revives, medical crates, squad spawn
Deaths drain Momentum. Medics revive faster, drop medical crates, and let people spawn on the squad. Build a med station as soon as you have a foothold so the next wave does not bleed tickets.
Light Machine Gunner (British attackers)
Mobile suppression while moving with the push
The closest thing to Isonzo Assault. High volume of fire while you can still move with the push. Heavy Machine Gunner is better once you have a captured position you need to hold while the rest of the team secures the HQ.

2Step-by-Step: What to Do Right Now

3Key Decision Points

4Common Mistakes That Bleed Momentum

Community consensus: Officer plus forward beacons plus Engineer (Saboteur then Builder) plus Bomber plus Medic is the combination that actually finishes sectors before Momentum runs out. Riflemen and LMG fill the gaps around them.