No more bases, this is it for every regiment/battalion. As to square, a quick search threw up this ~
The square continued to be a tactically relevant formation during the rest of the 19th century but as the infantryman’s musket evolved into the percussion-locked rifle the increased firepower and accuracy meant that infantry could face cavalry in line, this was demonstrated during the Crimean War at the Battle of Balaclava when the 93rd Highlanders were caught by advancing Russian light cavalry, the 93rd’s commander believed his men could withstand the charge without forming square. Instead the 93rd remained in line and fired volleys at 600, 350 and 150 yards halting the Russian charge. The accuracy, rapidity and weight of fire the two rank line was able to bring to bear halted the Russian cavalry before they reached the line. The Russian’s pulled back fearing a counter charge or British reinforcements.