Well, I figure I've been dragging my feet on an update for long enough, so here you go!
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'Our armies are invincible. Against all we have emerged triumphant. We do not travel halfway across this world for wealth, for glory, for salvation. We are here for only one reason: revenge. You have been warned.'
The victorious result of the Byzantine war against the Portuguese and then the Spaniards left the empire in possession of a solid base of operations from which to conduct further wars in the Old World. But despite the outward appearance of invincibility and territorial aggrandizement, the conflict had, so far, come at a heavy cost. Most of those who had originally sailed forth from New Constantinople in 1555 were now either dead or injured. Those who had followed after to reinforce the Byzantine armies were as well, as were their replacements as well. The human cost of war was great, both within the army and without. Southern Iberia was devastated, and Spain itself, once so mighty and powerful, was on the brink of collapse. Within a few short years, rebels in Catalonia, the Basque country, and Sicily would all proclaim their independence.
But Spain was merely the first step in the Empress' grand plan, not the ultimate destination. Using a combination of coercive measures and tapping the empire's vast treasury, the Byzantines appropriated the enormous shipyards of Seville and put them to work churning out a new fleet suitable for the closed waters of the Mediterranean. Calls went out for as many mercenaries as the empire could find, and all the while, more and more recruits continued to pour across the ocean, ready to do their part in the Holy Revolution. The Greek armies had already crossed half the globe. How hard could the rest of the journey truly be?
In fact, the task facing them was about the most daunting any army could hope to undertake. The armies of the Ottoman Empire were easily the largest, most advanced, most battle-hardened fighting forces in early modern Europe. The empire the Turks ruled from Constantinople stretched from the Euphrates to Algiers, and from Ethiopia to the Ukraine. It was a wealthy, prosperous, well-governed realm, and much of that wealth had been turned inward to make it one of the most heavily-defended places on earth. Though the Theodosian Walls of Constantinople remained formidable, the Ottomans had built comparable fortifications and city defenses in nearly every other city under their control. There was no chink in the army for an invading army to exploit. Attack from any direction would meet the same massive fortifications; the typical Ottoman garrison stood at 15,000 strong. There would be no repetition of the sweeping campaigns the Byzantines had conducted in Iberia.
Even if the Archon Karxarias had been privy to such details, it would have hardly deterred the crusaders. By the end of 1565, the Byzantine armies had been fully resupplied and reinforced, and the navy expanded to over a hundred war galleys. Modern estimates put the assembled invasion force at anywhere between eighty and ninety thousand soldiers. The Archons elected not to risk the whole invasion force in a single voyage, so only approximately half the army was present when the declaration of war was sent and soldiers landed at Corfu on January 22, 1565. By all rights, the Ottomans should have been better prepared for a potential attack; the Greeks had not been subtle about their intention of dismantling the Turkish state. There were only five thousand mobile forces in the whole of Greece when the Byzantines arrived.
Spurred on by this fortuitous circumstance, the Byzantine armies began their assault on the fortresses of Corfu on February 14. Unlike in Iberia, the progress was slow and exceptionally bloody. It took an entire month for the island to be taken fully on March 16, but in the end, the Byzantines had access to an excellent port on the very doorstep of the Turkish realm. Angry at how long it had taken, the Greek soldiers massacred those in the Ottoman garrison that had not perished in the fighting.
After seizing control of Corfu, the war fell into an uneventful lull until August, when the Byzantine fleet returned with the remainder of the invasion force. The knights of the Order of Hagios Isaakios stormed ashore in Epirus and rushed north into the mountains of Albania, while the infantry remained in Epirus in preparation for another assault. From their vantage point in Albania, the Order knights made a shocking discovery. Further to the east in Macedonia was a massive Ottoman relief army that easily numbered 90,000 soldiers. With shocking ease, the Turks had put an army into the field that outnumbered the entire Byzantine invasion force.
But long odds could not overcome the fanatical religious zealotry of the crusaders, who joked that an army so large would just make it easier to kill their enemy. In a fit of defiance, the Byzantines completed their occupation of Epirus by September 18. Enraged by the invasion, the Ottoman Sultan ordered his generals to attack at once. The great army in Macedonia split in half, with one contingent remaining in place while the other moved to attack the exposed Order knights in Albania. Prepared for such an eventuality, Archons Anqrakias and Abraxos hurried to the Order's relief with nearly thirty thousand of their own. Their intervention tipped the balance back in the Greeks' favor. On November 21, the Ottoman attack was beaten back decisively, but the victory proved short-lived, as the other half of the great Ottoman force simple pushed into Epirus, dispersing the tiny defense force there and splitting the main body of the Byzantine invasion - one in Albania, the other in Attica - in half.
The move, however, presented Karxarias with an opportunity to isolate and defeat in detail a sizable Ottoman force. Epirus was never a particularly prosperous or bountiful province, and the presence of forty thousand Ottoman soldiers rapidly depleted local food stores. Within six months, hunger and winter weather conditions had bled the Ottoman forces besieging Epirus down to half strength, a state only exacerbated by a botched assault in April. Karxarias sprung his trap, sending an army into Thessaly in the hopes of encircling the Ottoman army still in Epirus. The move ultimately proved unsuccessful, merely provoking the a counter-attack that pushed the Byzantines back behind their lines. But in so doing, it strung the Ottoman forces out into several vulnerable pockets. Of the once-enormous ninety thousand that had stood watch in Macedonia, only twenty thousand remained. This proved too tempting for the Order knights, who sallied forth from the protection of the rugged Albanian terrain to attack.
The battle was short, bloody, and decisive. Caught out in the open with nowhere to take shelter, the predominantly infantry force was easily surrounded and swarmed over by the irresistible force of twenty thousand fanatics. Within a few hours, an entire Ottoman army was wiped off the map. Not even two thousand knights fell in combat. It was just the sort of crushing victory the Byzantine crusade needed to maintain momentum against such an opponent. But it was only the beginning.