Is this what they mean by their determination to guard the borders?

Something hard and cold flicked in his eyes, followed quickly by determination.

His eyes dug deep at me, as though he would understand everything they saw by sheer determination.

Those approaches could work - if backed by enough determination.

But I did come back inspired by their determination that they do indeed succeed.

But by courage and determination, good turned the corner on evil.

She smiled again, amused by his determination to win the argument.

"If you really need it, by dogged determination you'll make that thing work."

Concerned by the government's determination to force through the bill, up to 500,000 people marched to protest on 1 July 2003.

She was beyond fatigue and hanging on by sheer determination of will.