The battle was not going as well as it had at first. As Tadaos said, they were learning.
They took out their first riverboat with a tree. During the night, they had chopped almost through the trunk of a huge pine tree right on the riverbank, then made a demonstration around it. When the RB14 Hotspur attacked, they dropped that tree right across her deck, which nearly smashed her in half Then they swarmed up the trunk and overpowered the crew.
By the time the RB12 Insufferable got there, the Mongols were learning how to use the swivel guns. After an exchange of gunfire, I ordered the Insufferable to bum the Hotspur with its flamethrower, and she went up quick. I pray to God in Heaven that all our men were dead before that happened.
They had mostly stopped using arrows on us, but they were still using the catapults, and still mounting them on hilltops. We kept on mowing down their crews and they kept on replacing them with a seemingly complete disregard for the lives of their men.
The RB21 Calypso got snagged on an underwater obstruction directly in front of one of the catapults. She took more than a dozen direct hits before her crew was taken off by the RB10 Not for Hire. By that time, the Calypso was completely out of ammunition, and her crew burned her before they left.
We got to avoiding the catapults as much as possible, and at full speed, zigzagging, it wasn't likely for a boat to be hit. It took a very tempting target to get one of our boats to slow down and stay near one spot, a temptation like a concentration of twenty thousand Mongols.
And seeing this, the enemy provided us with targets just to sucker us in! They were willing to spend ten or twenty thousand men just to kill one of our boats with less than three hundred men aboard! Madness!
Then they learned the best way to take out a riverboat, and we lost six boats in front of Sandomierz in less than an hour. Instead of rocks, they started throwing sewn-up ox hides filled with burning oil. The seasoned wood of our boats went up quickly, and usually we weren't able to save many of the crew. They were hurting us.
Yet we killed as many of them that day as we had on the first. I knew the ammunition we were using up, and I knew the conditions under which we were using it, mostly firing into packed crowds at pointblank range! Even the most conservative estimates still came out that we had killed over a million enemy troops! Yet they still kept coming!
We got to spraying our boats with water, inside and out, and this helped some. Wet wood burned more slowly and sometimes it took three or four fire bombs to destroy one of our boats. Fighting an oil fire with water is the wrong thing to do, but we didn't have any alternative. Sometimes enough oil could be flushed off the deck to save a boat. Sometimes not.
But the battle was on, and nobody ever suggested that we should quit. Even if we lost the Vistula, if we could kill enough of them, the rest of the army might have a chance. By midnight of the fifth day, we were down to nineteen boats.
We couldn't patrol much that night. All of the boats had to go back to East Gate to replenish supplies, and our crews were exhausted, physically and emotionally. At dawn, we found three bridges more than half completed across the river, and we lost four more boats taking them out. The enemy had found a target that we couldn't refuse.
But after that, they were back to throwing rocks at us. Our best guess was that they had simply run out of oil.
Yet there seemed to be as many Mongols as ever, despite the fact that there were long stretches of riverbank strewn with their dead. Near Sandomierz, the enemy dead were more than ten yards deep in some places, and still they kept coming, like lemmings to their deaths.
We were hardly patrolling north of Czersk at all, since our boats were generally more than half out of ammunition by the time they got there. Our strategy, if it could be called that, was no longer to hold the Vistula. We knew we couldn't. It was simply to kill as many of the enemy as possible, and that was easier to do near our base.
Every night, I sent a message to Duke Henryk, begging him to advance with whatever men he had available. And every day, I waited for his reply, in vain.