Games like Frontline Battles
Games like Frontline Battles include Company of Heroes 3, Broken Arrow, Call to Arms - Gates of Hell: Ostfront, Total War: THREE KINGDOMS, and Wargame: Red Dragon. We matched them by the tags players give Frontline Battles on Steam (Auto Battler, Action, Strategy, Singleplayer, and RTS): closest matches first, and among equally close ones the better-known games.

Company of Heroes 3
Shared: Strategy · Singleplayer · RTS

Broken Arrow
Shared: Strategy · RTS · Wargame

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · RTS · Singleplayer

Total War: THREE KINGDOMS
Shared: Strategy · RTS · Military

Wargame: Red Dragon
Shared: Strategy · RTS · Military

Men of War: Assault Squad 2
Shared: Strategy · Action · RTS

Call to Arms
Shared: Strategy · Action · RTS

Starship Troopers: Terran Command
Shared: Strategy · Singleplayer · RTS

Tempest Rising
Shared: Strategy · RTS · Singleplayer

WARNO
Shared: Strategy · Military · Wargame

Total War: WARHAMMER II
Shared: Strategy · RTS · Action

Company of Heroes
Shared: Strategy · RTS · Singleplayer

Master of Command
Shared: Strategy · RTS · Military

Steel Division 2
Shared: Strategy · RTS · Singleplayer

Company of Heroes 2
Shared: Strategy · RTS · Singleplayer

Steel Division: Normandy 44
Shared: Strategy · RTS · Action

Age of Empires III: Definitive Edition
Shared: Strategy · RTS · Military

Cossacks 3
Shared: Strategy · RTS · Singleplayer

Mechabellum
Shared: Auto Battler · Strategy · Wargame

Aliens: Dark Descent
Shared: Strategy · Action · RTS

Warpips
Shared: Strategy · Auto Battler · RTS

Total War: WARHAMMER III
Shared: Strategy · RTS · Action

Wargame: Airland Battle
Shared: Strategy · RTS · Military

Syrian Warfare
Shared: RTS · Military · Wargame