How to use "systems" in a sentence

they're now supposed to be our new friends, but they keep developing bacteriological weapons, new and more virulent strains of viruses, because they're broke, and this is a lot cheaper than other weapons systems

And all around it, some in their overturned war-machines and some in building-machines, and ten of them lying in a row, were the Martians - dead! They had been killed by germs against which their systems could not fight; killed, after all man's machines had failed, by the smallest things that God has put on this Earth.