 The plan of attack was for the British raiding force to sink two obsolete cruisers in the canal mouth at Ostend and three at Zeebrugge , thus preventing raiding ships leaving Bruges . The Ostend canal was the smaller and narrower of the two channels giving access to Bruges and so was considered a secondary target behind the Zeebrugge Raid . Consequently , fewer resources were provided to the force assaulting Ostend . While the attack at Zeebrugge garnered some limited success , the assault on Ostend was a complete failure . The German marines who defended the port had taken careful preparations and drove the British assault ships astray , forcing the abortion of the operation at the final stage . 
 The plan of attack was for the British raiding force to sink two obsolete cruisers in the canal mouth at Ostend and three at Zeebrugge , thus preventing raiding ships leaving Bruges . The Ostend canal was the smaller and narrower of the two channels giving access to Bruges and so was considered a secondary target behind the Zeebrugge Raid . Consequently , fewer resources <a href='uninflect' title='1'><mark>were</mark></a> provided to the force assaulting Ostend . While the attack at Zeebrugge garnered some limited success , the assault on Ostend was a complete failure . The German marines <a href='null_relcl' title='2'><mark>who</mark></a>defended the port <a href='been_done' title='3'><mark>had</mark></a> taken careful preparations and drove the British assault ships astray , forcing the abortion of the operation at the final stage . 
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