Strike is a synonym of Assume. Assume is a synonym of Undertake. 
Recession is a synonym of Withdrawal. Retreat is a type of Withdrawal. Retreat is a different concept from Attack. Attack is related to Confrontation. 
Strike <--Synonym--> Assume <--Synonym--> Undertake 
Recession <--Synonym--> Withdrawal <--IsA-- Retreat <--DistinctFrom--> Attack <--RelatedTo--> Confrontation 