forced to land
This statement can have a few different meanings.
Forced landing, as in had to land right there due to the damage, no option otherwise (such as engine failure, transmission damage, etc)
Or
Forced to land as in forced to fly to a suitable area for a precautionary landing and damage check.
Generally if one has been shot at you don't really want to land right there in the vicinity of the shooting, you want to get out of the immediate area.
Article is a little short on details to tell what "forced to land" means in this case.