war machine

noun2

1. •
   An individual weapon for war, especially a mechanical one such as a siege engine or tank.

   • Kobe was a shambles; the slaughter of the cotton operatives by machine-guns became classic as the most terrific execution ever achieved by modern war machines. — 1908
2. •
   The military resources of a belligerent country considered as a whole.

   • The German war machine was more powerful than that of the allies at the start of the war.