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... et ceterorum ut quisque audentiae habuisset, adcurrerent, trucidarentque, primas...

"as much of boldness daring"/"any (of) daring"; Furnaux's explains the genitive after "habuisset" as "a Graecism." This is doubly difficult. Greek can pattern a partitive genitive with adverbs, in a phrase such as "as much of boldness"; here, Tacitus implies/omits the adv.; the grammatical term is "brachylogy," conciseness of expression.