Stop comparing/mixing up the truth!
What has Achilles got to do with Ali sher e khuda? How dare you compare a saint and father of all sainthood to a kaffir who probably never exhisted.
Achilles was a mythical hero with an acute weakness in the heel. Ali had no weakness whatsoever and was undefeated throughout his career. Therfore your comparrison is disputable from the outset.
Leaving this matter aside the early wars were fought purely in the name of Islam. The three battles of Destiny in Islam will never be repeated, never.
The Prophet and the Quraish were of the same tribe. Therefore niether side had any political or elitist issues, the fight was over religion, full stop.
The Quraish were far from cowardly and they did not fight the first wave of Ansar duelists becuase they were not as well trained and equipt as the Meccan Kuffar. They would only fight the Muhajir who were as good as themselves. They may have been heretics and deviants but they too were braver than Americans.
Furthermore Ali accompanied Rasoolallah to Khaybar from the outset. Ali was present in every battle except Tabuk.
At Tabuk Rasoolallah left Ali behind, not becuase RasoolAllah feared for Ali and his future, Rasoolallah already knew there would be no fight at Tabuk. When there will be no fight why take Ali?
If you wan't to study the millatry evolution of Islam. Very well i will help you with this, however note well that during the life of Muhammed Sallalaho Alyhi wa Alhlehi wassalam, and khilafate rashidun. It was not becuase of muslim millatry strength that they won it was purely the divine help and blessings of Allah.
Islams Armies did evolve but only after the 8th century. Rasoolallahs soldiers won thier spectacular victories only with Allah and his Nabi's help. There is no other explanation, niether political or millitary to explain the dramatic rise of Islam.
Bear in mind that during this period Islamic armies had no cavalry or camelry as we know it today. They rode to battle but dismounted to engage the enemy. Also apart from the Yemini contingents there were no proffesional Archers and those that carried bows were few in number. Javelins were only a special weapon used by Abysinians, the Arab soldiers fought with spears at close quarters and used swords and axes when the spears broke.
Thus Islamic Armies during the 6th/7th century had nowhere near the firepower of thier opponents like the byzantines and more numerous Sassanids. So without firepower how could a smaller army beat a bigger one?
Sometimes armour or training helped smaller numbers of troops beat larger forces. However few of the early Islamic armies had enough armour. Even less were proffesional soldiers, mostly being carravan guards. Occasionally fighting tribal wars.So without shock troops how did the early Islamic armies beat armoured soldiers and even war Elephants?
Gibbon the 19th century historian states that quite clearly and in no uncertian terms what he believed was the reason for the amazing Muslim victories.
He says
" The Arabs of Arabia Magna had in the time before Muhammad been
a people of little significance to the region, proving in fact how inept
they were during thier wars with the nabatean empire and having even
beome a client state to Negus.
However such an infectous fervour and religous zeal had been ignited
within them by the love of Muhammad that after his victory over at badr
they became the irrisistable force of thier period and would come to
dominate the world of thier time.
Where others had destroyed the Muslaman would build, so that soon
entire nations flocked to the banner of Islam. It was these Moslems who
would preserve the long lost texts of the ancinets and aquire the wisdom
to rule both the empires of the Romans and that of the Persians"
How our armies have evolved eh?
Today we are more numerous than ever with more than 80 nations under our heel. Yet as a Muslim ummat tell me how much Allah is among us, thanks to some we no longer have the eternal blessings.
Perhaps we should not compare our forebears with others for a start. Our founders were as uniqe as thier empire.
Brothers there is time yet for Allah to be on our side.
No matter what others say our muslim founders have no peer.
Jis ke Naabi ka koi Saya nehien
Us kaum ka koi barabar Nahien!
Jis ke Ali jesa mahavir Nahien
us ka goi kise ka kabza nahien!
Ao saab Muslim thauba karo
Is thauba se bad ke taqat nahien!
Jis ke naabi ka koi saya nahien
us kaum ka koi barabar nahien!
Ya nabi nabi ya nabi nabi!