"Indeed," Arthur replied, making a mental note to chat with Merlin and warn him that, whenever they got back home, he should be careful.
"That's actually a tricky question." He explained, "We have our core army of several thousand. Also, many of the higher lords have their own armies, which legally owe fealty to the kingdom before the lords; so, while we do not regularly count them, we frequently add some or all of them, as needed-- depending on which ones we call upon, this can be a slight boost to our numbers, or can increase them exponentially. Then, there are certain mercenary groups whom we hire as the situation calls for..." With a laugh, he said, "It's probably simplest to say that we have never faced an opposing army whose numbers we could not exceed."
At Robin's comment about his bow, Arthur asked, "Which weapon suits you more?" He had found that, no matter how many weapons he mastered, none felt quite as right as a sword. However, he waved away the adjective regarding his wins. "It is necessary," he said simply. "If I cannot manage to win a tournament, the people have no reason to trust that I can keep them safe from Camelot's enemies." He could almost hear his father saying what he said next: "My losses are Camelot's losses." There was no self-pity in his words; it was fact. He resented it every so often, but was able to set aside those selfish druthers quickly enough.
((OOC: For the record, most of that stuff about the army my on-the-spot concoction, with a very little help from Google searches. Just so nobody thinks it's show canon or all that historically accurate. ;)))