We must be willing to lose our life--to sacrifice ourself, to give up our own way, our own ease, our own comfort, possibly even our own life; for there come times when one's life must literally be lost in order to be saved.
It was in a mine in England.

There had been a fearful explosion, and the men came rushing up from the lower level, right into the danger of the deathly afterblast; when the only chance of safety was in another shaft.

And one man knew this and stood there in the dangerous passage, warning the men.

When urged to go himself the safe way, he said, "No; some one must stay here to guide the others." Is there any heroism of this world's life finer than that?
It was at Fredericksburg, after a bloody battle.

Hundreds of Union soldiers lay wounded on the field.