Re: sideways on anchor?
If the tide is opposite the wind then often a boat will not lie 'to the breeze'. It's also true, though, that many fin keelers like to 'sail on their anchor', some to an alarming degree. A riding sail is one way to deal with that, as is (sometimes) anchoring by the stern.
A riding sail is a very flat sail hanked onto the backstay and sheeted amidships somewhere, it acts as a weathercock to discourage drifting off to the side. Even if it doesn't stop this action, it greatly 'softens' the yawing.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)