Kate was surveying the cove when she saw an intruder.
It was another fully mature female bald eagle. One I did not recognize.
Instantly Kate was out of the nest and above the other female.
Kate stayed in the higher position, talons dangling in a threat posture.
She herded the other female out of the cove. Both eagles were screaming.
When Kate got the intruder far enough out over the main lake, she turned and bolted for the nest.
Mom mission accomplished.

to see a short slide show of the interaction, please go to https://flic.kr/p/EKGqCA

WALK7459 03-05-16 @ 11-29-53 New Hope 03-05-16 @ 11-29-53 Haw

Suddenly Kate flung herself out of the nest. I couldn’t see a reason for her sudden leap.
I watched as she struggled against the gusting winds. Her head and body at an abnormal flight angle.
She regained the nest by jumping a limb that had fallen into the nest.
I think the falling limb had startled her badly enough for her to have momentarily left her chick(s).
Yes, I said chick(s) for it/they have hatched!
Everybody seems to be ok, whew!

WALK0560 02-18-16 @ 10-39-11 New Hope Kate out of nest

The sheer bulk of Godiva makes the strength showing in her wings all the more impressive.
Like all female bald eagles, Godiva is large, arrogant and owner of her share of the lake.

Godiva

WALK1560 Mar 26 2015  02-01-31 Haw River Kate in all her glory

Katherine, aka Kate, matriarch of New Hope, in all her prowess and glory.