Caligae were heavy-soled hobnailed military sandal-boots that gripped the ground firmly, even when it was sloping or slippery.
Peace is a state of tranquility/quiet, security/order (dictionary) It comes from the word Eire՜ne՜ meaning quietness, rest; from eiro-to join , tie together into a whole, undisturbed
Preparation is from the word Hetoimasia -the condition of preparedness, readiness; firm footing
Gospel comes from the word euaggelion -good news, to announce good news, "God's good news." The preparedness of spirit, the alacrity(readiness) which comes from the possession of a Gospel that sheds a calm over the heart and brings a man into peace with God (Alexander Maclaren) *The Gospel brings peace in the deepest sense – in the deepest part of our soul.
Arise you Prince and Princess, you Child of God, you Mighty Warrior, you Repairer of the Breach anoint your shield, take your sword, pray always, put on your breastplate of righteousness, put on your belt of truth, take your helmet of salvation and shod your feet with the preparation of the gospel of peace.