The Seige of Belgrade

An Austrian army, awfully arrayed,
Boldly by battery besieged Belgrade.
Cossack commanders cannonading come,
Dealing destruction's devastating doom.
Every endeavor engineers essay,
For fame, for fortune fighting-furious fray!
Generals 'gainst general grapple-gracious God!
How honors Heaven heroic hardihood!
Infuriate, indiscriminate in ill,
Kindred kill kinsmen, kinsmen kindred kill.
Labor low levels longest, loftiest lines;
Men march 'mid mounds, 'mid moles, 'mid murderous mines;
Now noxious, noisy numbers nothing, naught
Of outward obstacles, opposing ought;
Poor patriots, partly purchased, partly pressed,
Quite quaking, quickly "Quarter! Quarter!" quest.
Reason returns, religious right redounds,
Suwarrow stops such sanguinary sounds.
Truce to thee, Turkey! Triumph to thy train,
Unwise, unjust, unmerciful Ukraine!
Vanish, vain victory! vanish, victory vain!
Why wish we warfare? Wherefore welcome were
Xerxes, Ximenes, Xanthus, Xavier?
Yield, yield, ye youths! ye yeomen, yield your yell
Zeus', Zarpater's, Zoroaster's zeal,
Attracting all, arms against acts appeal!

Alaric Alexander Watts

(this is one astonishing poem, the largest poem of alliteration I've ever seen, and in perfect alphabetical order)