Meanings of pressed boldly in English

Nikolai only pressed boldly a step nearer.

That morning the enemy had pressed boldly forward, in three heavy columns, against Magruder's lines at Big Bethel Church.

He pressed boldly on to the north-west; but the excessive cold and the exhaustion of his provisions compelled him to return without accomplishing anything.

But he and Yellow Panther pressed boldly on, and they could now see dimly the outlines of individual tree trunks standing up in rows.