Jamieson, Fausset and Brown on Isaiah 10:27

27. his burden--the Assyrians' oppression (Is 9:3). Judah was still tributary to Assyria; Hezekiah had not yet revolted, as he did in the beginning of Sennacherib's reign.

because of--(Ho 10:15).

the anointing--namely, "Messiah" (Da 9:24). Just as in Is 9:4-6, the "breaking of the yoke of" the enemies' "burden and staff" is attributed to Messiah, "For unto us a child is born," &c., so it is here. Maurer not so well translates, "Because of the fatness"; an image of the Assyrians fierce and wanton pride drawn from a well-fed bull tossing off the yoke (De 32:15). So Is 10:16 above, and Is 5:17, "fat ones."