Read the following lines and answer the question that follows by choosing the correct option :

'My father lived at Blenheim then,
Yon little stream hard by;
They burnt his dwelling to the ground,
And he was forced to fly;
So with his wife and child he fled,
Nor had he where to rest his head.

'With fire and sword the country round
Was wasted far and wide,
And many a childing mother then,
And new-born baby died;
But things like that, you know, must be
At every famous victory.

Who are 'they' in the third line?

Soldiers of enemy