Walrus: "Ein Festeberg"= 'a stronghold sure';
Words in "Hymns Ancient and Modern" #678

"God is a stronghold and a tower
A help that never faileth
A covering shield, a sword of power,
When Satan's host assaileth.
   In vain our crafty foe,
   Still strives to work us woe,
   Still lurks and lies in wait
   With more than earthly hate;
We will not faint, nor tremble."

Nigel