Strategic Options Pack
From Halopedia, the Halo wiki
The Strategic Options Add-on Pack is a DLC content pack released for Halo Wars. The pack added 3 new gametypes to the multiplayer and Skirmish sections of the game and was released for 800 Microsoft Points on May 19, 2009. The DLC, alongside with the Historic Battle map pack, was later included in the 2017 Halo Wars: Definitive Edition. The pack was later made free for all players to download on in July 2017, alongside all other DLC for Halo 3, Halo Wars, Halo: Reach and Halo 4.
Experience Halo Wars in a whole new way with the Strategic Options Game Add-on. Three new game modes will require players to re-think their entire strategy and approach to the game. The modes include: Keepaway – capture the flag style game; Tug of War – who can field and maintain the strongest army; and Reinforcements – adapt your tactics as you are granted waves of troops.