Anvil Arrival | Halo - Official Site (en)

Halo Infinite's Operation: Anvil introduces a new mode called BTB: Sentry Defense6. In this mode, two teams of 12 players each must defend their base's AI-controlled sentry. The two sentries are Sentinel Bosses, also known as Adjutant Resolution in the Halo Infinite Campaign. Each team's sentry starts with 2000 hit points, which is reflected in the match score. Attacking the enemy team's sentry will reduce their score while using the Repair Field equipment on your team's sentry will increase your team's score. The first team whose score is reduced to 0 will lose the match.

Players can acquire the ASSAILER armor in Halo Infinite by participating in Operation: Anvil from July 2-30. By progressing through the Operation Pass with match XP and challenge completions, players can unlock the Sangheili-themed armor. Additionally, the Premium Operation Pass, available for 500 or 2000 credits, offers extra benefits such as the Smash and Grab weapon model for the M41 SPNKr and the Rent Seeker weapon coating5.