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Elementary school:

Stormed at with shot and shell,
Boldly they rode and well,
Into the jaws of Death,
Into the mouth of hell
Rode the six hundred.
-- Tennyson, "Charge of the Light Brigade"

College:

Once more unto the breach, dear friends, once more;
Or close the wall up with our English dead!
-- Shakespeare, "Henry V" act III scene 1 

Post-grad:

Hyġe sceal þȳ heardra,    heorte þȳ cēnre,
mōd sceal þȳ māre     þȳ ūre mæġen lȳtlaþ.
-- "Battle of Maldon"