What is "out-flank"

Usage examples of "out-flank".

I suspect that Louis knows he may soon see a sworn enemy sitting on the throne of England, and is making ready to out-flank that foe by shoring up relations with places such as Ireland, Scotland, and that flyspeck of rock where I was born.

But the Tribe of the Elk was outnumbered and out-flanked, and barbarian blood ran freer than the blood of their foes.