> For the complete documentation index, see [llms.txt](https://docs.solpatrol.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.solpatrol.io/game-mechanics/buildings/infirmary.md). # Infirmary The Infirmary determines your retreat rates after the mission is complete. This building level is key for players that wish to colonize the map at a rapid rate. The level of the Infirmary will determine the retreating speed of your troops. Though Boosts from the Weapons Depot can be used to increase the speed of a mission or invasion, it will not affect the time it takes for troops to retreat back to base. Only the Infirmary level has a direct impact on the speed for troops to retreat back to your City. This building is an offensive building, meaning you will have a slight increase in Attack Power during an invasion