Portion is related to Battle. Battle is related to Enemy. Enemy is related to Threat. 
Site is related to Grave. Grave is related to Person. Person is related to Pioneer. Pioneer is related to West. 
Portion <--RelatedTo--> Battle <--RelatedTo--> Enemy <--RelatedTo--> Threat 
Site <--RelatedTo--> Grave <--RelatedTo--> Person <--RelatedTo--> Pioneer <--RelatedTo--> West 