Could the Russian crisis of 93 have become a civil war?

In a word yes

I think it could have very easily turned into a civil war. This is from Wikipedia:

"After all, many officers and especially rank-and-file soldiers had little sympathy for Yeltsin. But the supporters of the parliament did not send any emissaries to the barracks to recruit lower-ranking officer corps, making the fatal mistake of attempting to deliberate only among high-ranking military officials who already had close ties to parliamentary leaders. In the end, a prevailing bulk of the generals did not want to take their chances with a Rutskoy-Khasbulatov regime. Some generals had stated their intention to back the parliament, but at the last moment moved over to Yeltsin's side."
 
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