Ge-wær

According to the Old English Dictionary:

ge-wær

Substitute: ge-wær in the phrase gewær (indecl. cf. wurðan thes firiho barn giwar, Hél. 3641. Uuir knadon geuuar uuorden sín, Notker 38, 9) weorþan to become aware of (gen.) :-- Þá fundon hí óðre flocráde ꝥ rád út wið Lígtúnes; and þá wurdon þá landleóde his gewær (the natives became aware of it), Chr. 914; P. 99, 5. Feórde se eorl tówardes Tínemúðan, ac þá þe innan þám castele wǽron his gewær wurdon (became aware of it, i.e. the earl's march), 1095; P. 231, 13. ge-wær