scour \SKOW-er\ verb
Meaning
1 : to move about quickly especially in search
*2 : to go through or range over in or as if in a search

We scoured the horizon, watching for something to break. The light was barely visible there, just a sliver of gold caressing the hills, but you could hear it breathing. The King's safety rested on us knowing the instant something happened, knowing when the attack would come. We couldn't know that it had already come, come from another quarter, a quarter where steel and quiver were futile. We should have watched there, in men's hearts, a place the morning sun was quite unseen.