2048
The concept of a highly mobile and protected fighting unit has been around for centuries ; from Hannibal 's war elephants to Leonardo 's contraptions , military strategists endeavoured to maximize the mobility and survivability of their soldiers .
 person: Hannibal; person: Leonardo
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Hannibal; person: Leonardo