ShortlyafterthistheFlorentineswererelievedinsomedegreeofthepressureofCastruccio'sarmy, owingtohisbeingcompelledtoleavehispositionsbeforeFlorenceandmarchonPisa, inordertosuppressaconspiracythathadbeenraisedagainsthimbyBenedettoLanfranchi, oneofthefirstmeninPisa, , intendingtoseizethecitadel, killthepartisansofCastruccio, , however, inaconspiracypaucityofnumbersisessentialtosecrecy, soforitsexecutionafewarenotsufficient, , , andbeheadedmanyothernoblecitizens, ; heemployedmuchthoughtandenergyuponsecuringhispositionthere, andthisgavetheFlorentinestheiropportunitytoreorganizetheirarmy, andtoawaitthecomingofCarlo, , andassembledagreatarmyofmorethanthirtythousandinfantryandtenthousandcavalry—, anddecidedthatitwouldbebettertomarchonthelatter—acourse, owingtotherecentconspiracy, morelikelytosucceed, andofmoreadvantagetothem, becausetheybelievedthatthesurrenderofPistoiawouldfollowtheacquisitionofPisa.
