Games like Siege Showdown
Games like Siege Showdown include Broken Arrow, Company of Heroes 3, Aliens: Dark Descent, Age of Darkness: Final Stand, and Age of Mythology: Retold. We matched them by the tags players give Siege Showdown on Steam (Strategy, Auto Battler, RTS, Real Time Tactics, and Action RTS): closest matches first, and among equally close ones the better-known games.

Broken Arrow
Shared: Strategy · RTS · Real Time Tactics

Company of Heroes 3
Shared: Strategy · RTS · Action RTS

Aliens: Dark Descent
Shared: Strategy · RTS · Real Time Tactics

Age of Darkness: Final Stand
Shared: Strategy · RTS · Action RTS

Age of Mythology: Retold
Shared: Strategy · RTS · 3D

Mechabellum
Shared: Auto Battler · Strategy · RTS

Door Kickers 2: Task Force North
Shared: Real Time Tactics · Strategy · Top-Down

Sudden Strike 4
Shared: Strategy · RTS · Real Time Tactics

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Real Time Tactics · Tactical

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · RTS · Action RTS

Age of Empires II (Retired)
Shared: Strategy · RTS · Medieval

Line War
Shared: Strategy · RTS · Auto Battler

Total War: WARHAMMER III
Shared: Strategy · RTS · Real Time Tactics

Door Kickers
Shared: Strategy · Top-Down · Tactical

Gladiator Guild Manager
Shared: Strategy · Auto Battler · Management

Last Train Home
Shared: Strategy · RTS · Real Time Tactics

Total War: MEDIEVAL II – Definitive Edition
Shared: Strategy · RTS · Medieval

Northend Tower Defense
Shared: Strategy · Auto Battler · Action RTS

Dune: Spice Wars
Shared: Strategy · RTS · Management

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · Real Time Tactics · RTS

Total War: ATTILA
Shared: Strategy · RTS · Real Time Tactics

Cossacks 3
Shared: Strategy · RTS · Action RTS

Wargame: Red Dragon
Shared: Strategy · RTS · Real Time Tactics

911 Operator
Shared: Strategy · Management · Real Time Tactics