Definition of "spede"

Those capitaines whiche come to faight a field, cannot stand behind a wal, or behind bankes, nor where thei maie not be reached: therfore it is mete for them, seyng thei cannot finde a waie to defende them, to finde some mean, by the whiche thei maie be least hurte: nor thei cannot finde any other waie, then to prevente it quickly: the waie to prevent it, is to go to finde it out of hande, and hastely, not at leasure and in a heape: for that through spede, the blowe is not suffered to bee redoubled, and by the thinnesse, lesse nomber of menne maie be hurt.

1560, Peter Whitehorne, Machiavelli, Volume I‎