Fatal attempt to break Prison.
--The San Francisco Herald states that on the afternoon of the 17th ult., while the great gate of the California State prison yard was opened to admit a water cart, the prisoners in the yard made a simultaneous rush for the gate, at the same time seizing the officers of the prison who were near enough, and holding them up as a protection from the fire of the guard. The guard, however, succeeded in surrounding them, and after a conflict, in which six of the prisoners were shot and killed by the guard and one of the officers shot (accidentally) in the wrist, the would-be fugitives were all captured with the exception of two, who managed to effect their escape in a skiff.
