Invader I Fighters were a class of star fighters used by the Venomian Army during the Lylat Wars. They were first encountered by the Star Fox Team during their recapture of the Cornerian base on Fichina (mistranslated as Fortuna in the orignal N64 version). Invader I Fighters are slow, have a single laser cannon with a slow rate of fire, and despite being quite large, they have thin armor, and because of their huge size they are easy targets. On top of that, the pilots are quite unitelligent, as they are seen crashing into the hills of Fichina. Because of these handicaps, they are no match for the Star Fox team. A common strategy for pilots of these fighters was for them to use at least two lead ships to draw fire, thus causing the pilot they are drawing fire against to be ambushed by another Invader I pilot. Improvements were made to the design with the Invader II Fighters and Invader III Fighters. They were evacuating at full speed and en masse, something Slippy also noted and asked. It was discovered that they were evacuating because they rigged the base with explosives to detonate in order to prevent the Star Fox team from getting it back.
NINTENDO POWER Star Fox 64: Official Nintendo Player's Guide. Redmond, WA, Nintendo of America. 1997.