Games like Skirmish Line
Games like Skirmish Line include Men of War: Assault Squad 2, Bomber Crew, Hearts of Iron IV, Door Kickers, and Total Tank Simulator. We matched them by the tags players give Skirmish Line on Steam (World War II, Strategy, Action, Indie, and Violent): closest matches first, and among equally close ones the better-known games.

Men of War: Assault Squad 2
Shared: World War II · Strategy · Action

Bomber Crew
Shared: World War II · Strategy · Simulation

Hearts of Iron IV
Shared: World War II · Strategy · Simulation

Door Kickers
Shared: Strategy · Action · Indie

Total Tank Simulator
Shared: Strategy · Action · World War II

Plague Inc: Evolved
Shared: Strategy · Indie · Simulation

Company of Heroes 2
Shared: World War II · Strategy · Tactical

Company of Heroes
Shared: World War II · Strategy · Action

Steel Division 2
Shared: Strategy · World War II · Simulation

Hotline Miami
Shared: Action · Violent · Indie

Game Dev Tycoon
Shared: Strategy · Indie · Simulation

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Action

Steel Division: Normandy 44
Shared: World War II · Strategy · Action

GemCraft - Chasing Shadows
Shared: Strategy · Indie · Action

Hell Let Loose
Shared: World War II · Action · Simulation

FTL: Faster Than Light
Shared: Strategy · Indie · Difficult

Door Kickers 2: Task Force North
Shared: Action · Strategy · Top-Down

Squad 44
Shared: World War II · Simulation · Action

Ultimate Epic Battle Simulator
Shared: Strategy · Simulation · Action

Infested Planet
Shared: Strategy · Action · Indie

Hotline Miami 2: Wrong Number
Shared: Action · Violent · Difficult

Call to Arms - Gates of Hell: Ostfront
Shared: World War II · Strategy · Action

The Escapists
Shared: Strategy · Indie · Action

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Indie · Action