So I was looking through Book of Battle, and I have some questions on how much loot a knight gets.

Let's use the Battle of Salisbury from Book of Uther as an example.

Using the default rules, Salisbury is, as written, a large battle that ends in decisive victory for the knights, with each knight getting 2 libra.

According to Book of Battle, a decisive victory in a large battle wins 10 libra, plus any ransoms. What it does not say, however, is if that libra is split between the knights or if each one gets a lump sum of 10.

In other words, say five PKs fought in Salisbury and all five made it to the end of the battle. If that loot is meant to be split between them, then things line up with Book of Uther, with maybe one or two knights have some extra cash from captured enemies. However, if each one gets 10 libra to himself, then he has five times what the books probably expect - he has an entire year's worth of the starting manor's production, or enough to pay the relief to get that manor.

So I need some clarification to see how much a knight actually gets from a battle.

Firstly, BoU's GPC Expansion was made to be consistent with GPC.

Secondly, the opponents in the Battle of Salisbury are Saxons, pretty much fresh off their boats. They don't have expensive warhorses, unlike Cymric knights. Their camp is not sacked, since that is basically their boats, which they manage to get out. So a lower loot is justifiable.

Book of Battle lines up reasonably well with some of the battles in GPC, where the enemy is other knights, and loot includes things like Chargers.

That being said, I personally find handing out chargers per knight way too generous, save when the PK side wins a miraculous fight while heavily outnumbered: in order for EACH knight in the victorious side to win a charger as loot, they would have needed to cause knightly casualties equal to their own number. Unless they are outnumbered 5:1, or the enemy is unable to escape, this is extremely unlikely to happen, since the medieval armies tend to break around 10% - 20% of the casualties. Of course, you can get around this dilemma by declaring that the loot share given is implicitly for the PKs, who are supposed to be heroes, and that the NPKs get less. One thing I have been toying with is giving loot equal to the 'multipliers' that the PKs rack up during the battle rounds (using the old Battle system): 2 for a critical, 1 for a success, and 0.5 for a failure. Multiply that with a suitable number (0.25 for the Saxons, 1 for the knights, off the top of my head), and that is then the amount of loot (usually in horses and armor and stuff like that) that they'd get, in £. A bigger battle means that while there is more loot for the army, there is also more knights to share it with. However, I might give a multiplier for being outnumbered, since then clearly, there is more loot to be shared on a victory.

Alright, looking through both Uther and the GPC proper the results do mostly line up with Battle. In fact, Salisbury and Badon seem to be the only outliers, with Salisbury giving one fifth and Badon giving double the appropriate amounts - but then, as you said, Salisbury involves Saxons fresh off the boats, and Badon is Badon, so in those cases the difference is proabably justifiable.

I do agree that the numerous horse awards are probably too much, and would personally supercede them with the wealth described in Battle. Instead I'd have the PKs win horses either in place of or as part of the ransom (for knightly opponents only, of course), similar to a joust or adventure - for one it makes sense for a knight's ransom to include a horse, and secondly it makes the new horses feel like something the PKs earned, rather than something they're entitled to for showing up.