Hasan Pasha organized his artillery into three groups and deployed it around Bihać, so they were able to shell it from all directions.[31][32] The bombardment of the city began on 14 June, which could be heard in Slunj 25 miles (40 km) away.[31] The first phase of it did not cause significant damage to the walls,[32] but the sheer number of cannons and the lack of reinforcements caused fear in the city and the loss of hope in the possibility of its defence.[30] On 19 June Hasan Pasha ordered an infantry assault on the fortress.