Task: Pos Tagging
Input (English): Sentence: Finally , Magwitch's pursuit of Compeyson , his archenemy and betrayer , begins by his holding him in a vicelike grip on the river flats to frustrate his escape and culminates in his `` laying his hand on his cloak to identify him '' , thus precipitating the death-locked struggle in the water during {{ which }} Compeyson drowns . 
Word: which
Output (English): DET