71800
When Confederate fire repeatedly prevented this , and a heavy artillery bombardment failed as well , the decision was made to send small groups of soldiers in pontoon boats across to dislodge the defenders .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None