They'll be on their mettle, the both of 'em, more 'specially Diablo.
The assistant was on his mettle, and either failed or triumphed.
This set me on my mettle, and I worked hard and with some success.
Yet you have heart and mettle, I believe, else you would not be here.'
We think that it is a mistake to put our artists on their mettle in this way.
The old man, despite ...