ejus, i.e. Pompey's.
bellis: there is a gap here, which must have contained a thought like "Was there in your minds a zealous desire of victory?"
cum videres, second person of indef. subject in a general condition: § 518, a (309, a); cf. B. 302, 2; cf. G. 597, R3; H. 578, 2 (508 5); cf. H.-B. 504, 2.
esset, subj. of characteristic; but for that it would be indic. (erat) by § 517, b (308, b) ; G. 599, a.3; 14.583 (511, N3); H-B. 581, e.