And yet he and his Operation Eagle forces had proved invulnerable to the attack of Carpathia's army.

Steve Bronson tried to oppose the alien Sandman, but it proved invulnerable to physical assault.

This acceptance in Britain that the heavy bomber would prove virtually invulnerable led to the creation, from 1935, of a heavy bomber force.

However, there they run into Ruguduroll, who taunts Lyle and proves invulnerable to both swords and magic before vanishing, leaving the sword behind.

So he decides the Cowboys will tempt the Redskins with a vulnerable Flozell Adams all on his own and hope that he proves invulnerable.

In the dark of night, the monster attacks Tokyo, and it proves invulnerable to conventional military weaponry no matter how concentrated.

Unlike central stations, they proved invulnerable to Allied bombing.

The high-altitude version proved practically invulnerable to interception above 5,500 m (18,000 ft).

But no, the Martians had already proved invulnerable to even the foul clouds which the Army tried to deploy.

In the Centaur battle, Caeneus proved invulnerable, until the Centaurs simply crushed him with rocks and trunks of trees.