I will answer your next question and just post this from the CRD4.0:
control
Shadow players may use effects to take control of sites on the adventure path. When you take control of a site, place that site in your support area, lengthwise.
A Shadow player may only take control of a site on the adventure path if all player markers are on sites with higher site numbers.
When all player markers are at site 2 or higher, you may take control of site 1.
When a Shadow player takes control of a site, the site on the adventure path with the lowest site number must be selected.
An opponent controls site 1 and all player markers are at site 3 or higher, so you must take control of site 2.
The game text of a controlled site cannot be used by any player. Exception: The keywords of a controlled site still apply.
A player may "control a battleground."
When your opponent controls a site from your adventure deck, it's still your site.
Some cards can replace a controlled site. Move any cards stacked on the site being replaced to the new site, then return the old site to its owner's adventure deck.
liberate
A Free Peoples player may have a card effect that allows him to liberate a site. Only a site that another player controls may be liberated. You cannot liberate a site on the adventure path, a site in any adventure deck, or a site you control.
When you liberate a site, place it back on the adventure path. Any cards on that site are discarded. You must liberate the site with the highest site number controlled by one of your opponents first, regardless of which opponent controls that site. (If you control the site with the highest site number, you must liberate the next highest site controlled by an opponent.)
Cheers.
-wtk