During the war the fort's river batteries were close to the river, but since the war erosion factors have caused the river to move a mile west.
(the fort's river batteries; were; close to the river; T:During the war) (the war erosion factors; have caused; the river to move a mile west)
the fort's river batteries the war erosion factors
were have caused
close to the river T:During the war
the river to move a mile west