Riddle 76

Now glory to the Lord of Hosts, from whom all glories are,
And glory to our sovereign liege, King Henry of Navarre!

He was my first, a mighty man, a warrior for the right;
He showed my whole, and went my first when he my last to fight.

Although my last is duty’s cry, with some it goes for naught;
In all adventures have my whole, if you would not be caught.