"falsly accusing him [of having been in] in Numitor's land,"falso accusantes 'in Numitoris agros ab iis impetus fieri
This is a puzzling construction. It seems intended to mean literally "falsely bringing the accusation that an attack on Numitor's fields was made by them". But accuso
generally takes a direct object and a genitive of the crime; and I don't see any passages quoted in Lewis and Short or in the Oxford Latin Dictionary where accuso
is used with an accusative + infinitive construction. http://perseus.uchicago.edu/cgi-bin/philologic/getobject.pl?c.0:430.lewisandshort
The OLD gives an example from Cornelius Nepos (Themistocles 8.2) where accuso
is used with quod
+ subjunctive, but that could mean "they brought an accusation against him because [or "on the grounds that"], they said, he . . . ."
It's not clear to me that the usage of accuso
here with the accusative + infinitive construction is real Latin. Here's what Livy actually wrote:[Ferunt] Remum cepisse, captum regi Amulio tradidisse, ultro accusantes. Crimini maxime dabant in Numitoris agros ab iis impetum fieri; inde eos collecta iuvenum manu hostilem in modum praedas agere.
" . . . they also brought a charge against him. As an accusation [crimini
] they mostly alleged that . . . "