Engage the Enemy

Engage the Enemy is Disc 1, Track 9 on the Xenoblade Original Soundtrack. It plays during cutscenes before and after important boss fights in the game:

Xenoblade Chronicles

 * Metal Face attacking Fiora in Colony 9
 * Before the battle against the in Spiral Valley
 * Before the battle against Xord in the Ether Mine
 * The cutscene between the two phases of the Leone Telethia
 * Metal Face appearing on Prison Island
 * After the fight with Mumkhar on Valak Mountain
 * After the battle with Mumkhar in Sword Valley
 * The battle between Zanza and Meyneth in the Mechonis Core
 * Between the two phases of the battle against Dickson

Future Connected

 * When the Telethia destabilise the Fog King's rift, allowing Melia to finish it off.

As part of a promotional video for Xenoblade Chronicles 3D, this track was rearranged by Tomori Kudo.

In Super Smash Bros.
A shortened and looped version of Engage the Enemy is one of the music tracks in both and, available on the  and (in Super Smash Bros. Ultimate) the  stages.

A section of the piece was also remixed for the Xenoblade Chronicles Medley.

In Project X Zone 2
A remix of Engage the Enemy was made for Project X Zone 2. It plays in Chapter 6, 'You Will Know Our Names', when Fiora introduces herself to KOS-MOS, as well as later on when Metal Face appears.

Trivia
There exists a post-battle dialogue in Xenoblade Chronicles 2 between Ursula and Rex during which they sing a tune that sound very similar to Engage the Enemy. There is also a similar dialogue with Electra.