Hey, hard to say if that was a good call of not, and i guess a lot would depend, in my mind at least, as to what your stock/bond/cash ratio was to start with. And at what level you sold at. But that said, 10% on the sidelines is nothing to beat yourself up over and I have about that much in cash at this time also.
Of course, it's all your approach, and that differs with each of us.
Honestly, i would consider even keeping more than that on the sidelines now even knowing what we know of the recent bounce/rebound.
I never expect to catch these things at the optimal points, Hell, after a 10 year bull market, i have no qualms about giving a little back in order to protect those significant gains. I figure it's part of he mix and when i see a paper gain, i know that I can only hope for maybe actually realizing most, but probably not all of it.
At the moment, I am still about 10% in cash but i was able to do some buying at the lower levels over the last few weeks.