In LLPSI Cap XXXVII Orberg scripsit:
Urbis custodibus occisis, portas patefecerunt et ceteros Graecos, qui interim Tenedo redierant, in urbem receperunt.
'custodibus occisis' is an ablative absolute. But how does the genetive 'Urbis' work in the sentence? Is it 'the guards OF the city having being killed.......
