Ten others were told off to the same prison as Fergus.
The fort was the one nearest to the river, on the west side of the city; and stood but a hundred yards from the bank, its guns being intended to prevent any passage of the Danube, as well as to guard the city against a land attack from that side.

It was a strong place but, as it was situated in a flat country, it presented no natural obstacle to an escape.

It was surrounded by a broad moat, fed by a cut from the river.

On the other side of the moat were two small redoubts, facing west.

The fort contained ample barracks for the garrison of three hundred men who occupied it, with bomb proofs in which they could take refuge, in the event of a siege.