This was the last attempt by Thomas to break the siege.

We have been told for years that air power alone could not begin to do the job of breaking the siege.

The expected help from the English failed to appear, and he had to break the siege on his own.

However, after a brave defense, he was able to break the Russian siege.

The British won the battle, but at a very large cost, and were unable to break the siege.

I'd say that your first job is to break the siege.

Greek forces outside the city were desperately trying to break the siege.

Its arrival is considered to have broken the siege of that island.

Perhaps it might be possible to break the siege by causing a distraction.

The attack achieved limited success, but the French were unable to break the siege.