Some = ship's biscuit:
‘bread, n. < Old English bréad . .
. . 6. Extended to various preparations of the composition or nature of bread.
. . †b. Sea-biscuit. Obs.
1651 Severall Proc. Parl. No. 84. 1289 We have taken..2 casks of Bread, and one barrel of Pease in one Vessel.
1746 in W. Thompson Royal Navy-men's Advocate (1757) 18 The Bread..is all good, but..it has been..long aboard . . ’