The documentation page is not finished yet. We're doing our best to have it ready as soon as possible. Sorry for the inconvenience.
To analyze incoming attacks you can either fill in "Last checked before" field (how long has it been since you last checked and there were no attacks) when reporting attacks or use our more complex tool.
It is located under the eye icon when you expand the attack list.
Here you can fiddle with all different options to find out which possible troops are coming at you.