One Problem At a Time
From Halopedia, the Halo wiki
One Problem At a Time is the eighteenth track in Halo Wars: Original Soundtrack.
The track opens with strings on a flowing melody, soon joined by brass. Woodwinds take over briefly in a uncertainty melody, with percussion cutting in. The instruments fade to the background, with the track ending with soft ambiance by vocals and piano.
The track plays in "I Doomed Humanity", the opening cutscene of the fourteenth Halo Wars campaign level Reactor, when Red Team and Sergeant John Forge are unloading the Shaw-Fujikawa Translight Engine of the UNSC Spirit of Fire.