Gilliver considers all of Caesar's actions in 55 BC to be a "publicity stunt" and suggests that the basis for continuing the Celtic/Germanic campaign was a desire to gain prestige. This also explains the campaign's brief time span. Caesar wanted to impress the Romans and scare the Germans, and he did this by crossing the Rhine in style. Instead of using boats or pontoons as he had in earlier campaigns, he built a timber bridge in a mere ten days. He walked across, raided the Suebic countryside, and retreated across the bridge before the Seubic army could mobilize. He then burned the bridge and turned his attentions to another feat no Roman army had accomplished before—landing in Britain. The nominal reason to attack Britain was the British tribes had been assisting the Gauls, but like most of Caesar's "casus belli" it was just an excuse to gain glory.