Unware

When now the Gods have made proud Ilion fall, / and Asia's power and Priam's race renowned / o'erwhelmed in ruin undeserved, and all / Neptunian Troy lies smouldering on the ground, / in desert lands, to diverse exile bound, / celestial portents bid us forth to fare; / where Ida's heights above Antandros frowned, / a fleet we build, and gather crews, unware / which way the Fates will lead, what home is ours and where.

Source: tatoeba (6916441)

"But mad with love's despair, / and stung with Furies for his spouse denied, / at length Orestes caught the wretch unware, / e'en by his father's shrine, and smote him then and there."

Source: tatoeba (7051113)

And soo in this rassynge and hurlyng as syre Launcelot thrange here and there it myhapped hym to slee Gaherys and syr Gareth the noble knyghte for they were vnarmed and vnware. "And so in this rushing and hurling, as Sir Launcelot thrang here and there, it mishapped him to slay Gaheris and Sir Gareth, the noble knight, for they were unarmed and unware."

Source: wiktionary