Salamun alaykum,
one thing crossing in my mind, that 4 sacred month no longer exist after the year when the Believers had made covenant with the Rejecters. Some of the rules in Al Quran has been made based on the situation in Rasulullah Muhammad time. And this rule could not be applied anymore along with the death of Rasulullah.
For example this rule:
4:59 O you who believe, obey God and obey the messenger and those in authority <ulil amri> among you. But if you dispute in any matter, then you shall refer it to God and His messenger if you believe in God and the Last Day. That is better and more suitable for knowing.
Since the messenger no longer with us, we could ask, who the authority among us? and what the things fall to dispute?
The answer is in 4:83:
4:83 And if any matter regarding security, or fear, (during the war) comes to them they make it publicly known, but if they had referred it to the messenger and to authority <ulil amri> among them then it would have been known by those who studied it from them. And had it not been for the grace of God upon you and His mercy, you would have followed the devil, except for a few.
So the matter was about security and fear during the war in Muhammad time. And the authority among them were those who studied the matter (also known as intelligence).
How do we fall into dispute about the thing which had been done centuries ago, and the people whose had the authority to investigate it had died?
So this verse, 4:59, contain the rule which only applicable at the Muhammad time, and no longer applicable in our time nowadays.
Now, what about the 4 sacred months?
As you can see that the four sacred months has been declared based on the Allah and Rasul revocation in this verse:
9:1 A revocation is made by God and His messenger to those with whom you have made a covenant from among the polytheists.
9:2 "Therefore, roam the land for four months and know that you will not escape God, and that God will humiliate the rejecters."
The four sacred months here means to make a truce with the Rejecters, and its duration is 4 months. That's why the months are called "ashurul hurumu" or the months to refrain from a thing, and the thing here is war.
Ha-Ra-Miim = refrain from a thing
Also you could consider these following verses:
9:7 How can the polytheists have a covenant with God and with His messenger? Except for those with whom you made a covenant near the Masjidil Harami, as long as they are upright with you, then you are upright with them. God loves the righteous.
The covenant made near the Masjidil Haram.
9:28 O you who believe, the polytheists are impure, so let them not approach the Masjidil Haram after this year of theirs; and if you fear poverty, then God will enrich you from His blessings if He wills. God is Knowledgeable, Wise.
So the place that Believers made covenant with the Rejecters is near the Masjidil Haram, and 9:28 confirming that there's no other way for the Rejecters to approach the Masjidil Haram after theirs year (the year when the covenant had made). It means that there is no more covenant will be made after that. And it means the Sacred months to make a truce no longer needed.
So I think, the sacred months, must be treated the same way just like a rule in 4:59 which is no longer applicable nowadays.
But even so, I believe that there is a moral behind the stories to strengthen our heart, but not to argue what month does the sacred months, cause it really depend on when the covenant being made.
And regarding 9:36, I encourage you to read and put this verse into the context of Surah at-taubah.
Surah at-Taubah is unique, it's a kind of live report during the war. To inform Rasulullah about the war, and its preparation, the strategy, the covenant, and to inform the betrayer among the believers, confirming God's help, inform the weakness of Believers, intelligence, etc.
Yes, this war is so important.
Any thoughts?
peace