Caesar landed without resistance and immediately went to find the British army. The British used guerilla tactics to avoid a direct confrontation. This allowed them to gather a formidable army under Cassivellaunus, king of the Catuvellauni. The British army had superior mobility due to its cavalry and chariots, which easily allowed them to evade and harass the Romans. The British attacked a foraging party, hoping to pick off the isolated group. But the party fought back fiercely and thoroughly defeated the British. They mostly gave up resistance at this point, and a great many tribes surrendered and offered tribute. Caesar assaulted Cassivellaunus' stronghold (likely modern day Wheathampstead), and he surrendered. Caesar extracted payment of grain, slaves, and an annual tribute to Rome. However, Britain was not particularly rich at the time; Marcus Cicero summed up Roman sentiment by saying, "Its also been established that there isn't a scrap of silver in the island and no hope of booty except for slaves and I don't suppose you're expecting them to know much about literature or music!" Regardless, this second trip to Britain was a true invasion, and Caesar achieved his goals. He had beaten the British, extracted tribute, and they were now effectively Roman subjects. Caesar was lenient towards the tribes as he needed to leave before the stormy season set in, which would make crossing the channel impossible.