ta rama eko bhagavan asudayat
acodayat—he sent for fighting; hasti—with elephants; ratha—with chariots; asva—with horses; pattibhih—and with infantry; gada—with clubs; asi—with swords; bana—with arrows; rsti—with the weapons called rstis; sataghni—with weapons called sataghnis; saktibhih—with weapons called saktis; aksauhinih—whole groups of aksauhinis; sapta-dasa—seventeen; ati-bhisanah—very fierce; tah—all of them; ramah—Lord Parasurama; ekah—alone; bhagavan—the Supreme Personality of Godhead; asudayat—killed.
Upon seeing Parasurama, Kartaviryarjuna immediately feared him and sent many elephants, chariots, horses and infantry soldiers equipped with clubs, swords, arrows, rstis, sataghnis, saktis, and many similar weapons to fight against him. Kartaviryarjuna sent seventeen full aksauhinis of soldiers to check Parasurama. But Lord Parasurama alone killed all of them.
The word aksauhini refers to a military phalanx consisting of 21,870 chariots and elephants, 109,350 infantry soldiers and 65,610 horses. An exact description is given in the Mahabharata, Adi parva, Second Chapter, as follows:
“One chariot, one elephant, five infantry soldiers and three horses are called a patti by those who are learned in the science. The wise also know that a senamukha is three times what a patti is. Three senamukhas are known as one gulma, three gulmas are called a gana, and three ganas are called a vahini. Three vahinis have been referred to by the learned as a prtana, three prtanas equal one camu, and three camus equal one anikini. The wise refer to ten anikinis as one aksauhini. The chariots of an aksauhini have been calculated at 21,870 by those who know the science of such calculations, O best of the twice-born, and the number of elephants is the same. The number of infantry soldiers is 109,350, and the number of horses is 65,610. This is called an aksauhini.”
Link to this page: https://prabhupadabooks.com/sb/9/15/30