2 Verbs to Use for the Word sierra

They then rejoined their companions at Darien, promising, however, to send the soldiers his son desired to assist him in crossing the sierra and reaching the southern ocean.

In traversing these lofty sierras the traveller is often obliged to alight and lead his horse up and down the steep and jagged ascents and descents, resembling the broken steps of a staircase.

2 Verbs to Use for the Word  sierra