Ge-cræftgian

According to the Old English Dictionary:

ge-cræftgian

p. ade; pp. ad [cræft I. power, strength] To strengthen, make powerful; firmare, roborare :-- Ða rícu of nánes mannes mihtum gecræftgade ne wurdon the kingdoms were not strengthened by the powers of any man. Ors. 2, 1 : Bos. 39, 2. ge-cræftgian