Union is related to War. War is related to General. General is a type of Fact. Fact is related to Data. 
Gathering is related to Assemble. Assemble is a synonym of Gather. Gather is related to Meeting. Meeting is related to Assembly. 
Union <--RelatedTo--> War <--RelatedTo--> General --IsA--> Fact <--RelatedTo--> Data 
Gathering <--RelatedTo--> Assemble <--Synonym--> Gather <--RelatedTo--> Meeting <--RelatedTo--> Assembly 