While the troops, dividing into two parts when passing around the Kremlin, were thronging the Moskva and the Stone bridges, a great many soldiers, taking advantage of the stoppage and congestion, turned back from the bridges and slipped stealthily and silently past the church of Vasili the Beatified and under the Borovitski gate, back up the hill to the Red Square where some instinct told them they could easily take things not belonging to them.
There are no more uses of "Red Square" in the book.
Show samples from other sources
Against his chest gleamed a blood-red square.
Cassandra Clare -- City of Heavenly Fire
She dips the brush in water and wets the paper, then taps at the red square.