"This brings us to a statement over which multitudes have stumbled: concerning the blood flowing out of the winepress, even unto the horse bridles, for a distance of a thousand and six hundred furlongs. This is a scary scene for those who think this is literal or that there is a literal battle of Armageddon with hundreds of thousands of soldiers, horses, and rivers of blood flowing. Men who persist in teaching that this is a literal scene should stop to consider all the facts involved in what the prophet saw. We have a description of the harvest and vintage of the earth. No man can maintain other than that these are a figurative harvest and vintage of the earth, to be followed by the great spiritual feast of Tabernacles. Even the so-called “literalists” are not literal in this respect, for they don’t view it as a natural harvest or vintage of grain and grapes! We also find the reapers with sickles, gathering the clusters of the vine, whose grapes are fully ripe. No man can maintain that these are literal sickles, literal vines, and literal grapes! The grapes were cast into the winepress of the passion of God. However one interprets the scene, that winepress is not a literal winepress. No sane man can dispute these statements. Neither is the treading a literal treading. And yet in view of all these facts unspiritual men maintain that the balance of the prophecy has to be fulfilled literally, they doggedly persist in alleging, against all reason, that the predictions concerning blood, and horses, and bridles, and the sixteen hundred furlongs, must be fulfilled literally! In their folly they refuse to believe that this scripture is fulfilled unless it can be shown that such an impossible event has actually been seen by man!"

Much more on blood and wine in the link:

https://www.godfire.net/eby/rev173.html