Thanks, I've already Ms. Cross's entire site and her work on Roman Women. She also has an excellent account on Augustus. Mind you most members of this forum are very well read on the subject of ancient Rome, and implying that we are not, is yet another irritant.
Now I'll point you to my own account of Caesar's affair in Britain just as a matter of course.
First Invasion of Britain
I am a big admirer of Caesar and his accomplishments. His crossing to Britain was a huge coup from a propoganda perspective, and he did exact a relatively minor amount of tribute. However, his crossing did not lead to any lasting degree of Roman dominance of the island. His presence was hotly resisted and even though the second invasion did provide a measure of 'face saving', he was fortunate to escape after the first invasion.
Why did he return the second time? Because the first time was unsuccessful. Had he defeated the Britons enough for them to submit he would've left victorious with hostages and the proper tribute. Instead he had to go back to Gaul, regroup and return with a larger more intimidating force. Did Caesar get what he wanted out of his crossing? Of course he did. He subdued a part of the coastal region and souther Britain and gathered even more fame. Just like his crossing of the Rhine, while impressive, did not end in the subjugation of Germania, the crossing of the canal did not lead to the subjugation of Britain.
In the end, the first invasion was a minor defeat because his goal was not accomplished. He rectified it on the second invasion but the first still counts. While Gergovia is a defeat and he followed it up with the brilliant siege of Alesia, we still recognize Gergovia as a defeat.