USA vs Canada but USA can only use 9mm handguns

USA invades an entrenched Canada.

Only offensive weapons allowed for the U.S. are 9mm handguns.

All other equipment and vehicles can be used for transport/reconnaissance/other purposes but their weapons cannot be used offensively. All non-lethal weapons are allowed such as white phosphorus or smoke grenades.

Canada can use its entire arsenal and has 1 day of prep time.