How to pronounce“bivwak”in English

the whole track was encountered immediately the bivwak was left and the column of nearly 6,000 men had to trickle through one narrow place in

that squalls and capsizing in the water and consequent bivwak on the Deep were matters of common occurrence in this kind of Life considering that at the

Place not commanded by the opposite bank and the shade of eight or 10 thorny bushes afforded the first suitable bivwak at 3:30 p. m. on the 30th the