Shortly thereafter the truce was irretrievably broken by the Goths, when they attempted to enter the city in secret. First they tried to do so by using the "Aqua Virgo" aqueduct. Unfortunately for them, the torches they used to explore it were detected by a guard on the nearby Pincian Gate. The aqueduct was put under close guard, and the Goths, perceiving this, made no attempt to use it again. A little later, a sudden attack against the same gate was repulsed by the guards under the command of Ildiger, Antonina's son-in-law. Later, with the aid of two paid Roman agents, they tried to drug the guards at a section of the walls near St Peter's and enter the city unopposed, but one of the agents revealed the plan to Belisarius, and this attempt too was thwarted.