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The Barbarian Invasions

The Campaign has 6 Scenarios total. I just played the first two because the next two dealing with later periods sound very hard: You must kill 500 Roman units in the 3rd Scenario. And the Designer calls the 4th a "Deathmatch" where the enemy has a 400 soldier capacity. I suggest playing the Goth scenarios with the "Mittelalterliche Musik" Mod (https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1505363816) I must break my review into several messages due to word limits:

SCENARIO #1. The Arrival of the Barbarians.
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DATING THE SCENARIO:
I tried figuring out what time period it takes place. I took it to date to 117 AD-410 AD, because the campaign map shows Wikipedia's map of the Roman empire dated to 117 AD. Wikipedia's map marks Rome's vassals in Hungary and Romania in pink, and the Designer put the Scenario's icon on that part of the map. You play as the Goths.

Wikipedia's article on the Goths says :
<<Beginning in the middle 2nd century, the Wielbark culture [associated with the Goths] shifted southeast towards the Black Sea. During this time the Wielbark culture is believed to have ejected and partially absorbed peoples of the Przeworsk culture. This was part of a wider southward movement of eastern Germanic tribes, which was probably caused by massive population growth. As a result, other tribes were pushed towards the Roman Empire, contributing to the beginning of the Marcomannic Wars... The first incursion of the Roman Empire that can be attributed to Goths is the sack of Histria in 238.>> Histria is at the modern Romanian city of Istria.

The Wikipedia article on the Macromannic Wars says: <<The Marcomannic Wars (Latin: bellum Germanicum et Sarmaticum, "German and Sarmatian War") were a series of wars lasting over a dozen years from about 166 until 180 AD. These wars pitted the Roman Empire against, principally, the Germanic Marcomanni and Quadi and the Sarmatian Iazyges; there were related conflicts with several other barbarian peoples along both sides of the whole length of the Roman Empire's northeastern European border, the river Danube. The struggle against the Germans and Sarmatians occupied the major part of the reign of Roman emperor Marcus Aurelius...>>

The second part of this first scenario has you take one of 4 relics, the easiest to get apparently being a relic from the southwest of the Rhine in Southern Germany or France. The Goths did not get that far in 117-238 AD, so you can interpret the scenario as just starting in 117-238 AD but continuing. I don't know when the Goths crossed the Rhine, but they sacked Rome in 410 AD.

SCENARIO ADVICE:
Be careful when scouting the red walls to your west and south because their arrows are strong. Forget about trying to send a ship to Carthage through the Bosphorus.You need to make fire ships because the enemy sends in boats.

MY EXPERIENCE
On HARD, the opening part where you need to destroy the Romanian Town Center was not too hard. I destroyed the towers in Moldova and then built a castle there. But the next part became overwhelming, with masses of enemy swordsmen and crossbowmen flowing through Bulgaria. Then even Elite Teutonic Knights came. One of the complicated parts about the second objective is that since you have a strong ally, your ally could take the relics while invading. If Players like one of the Commentors thought that the first mission was too easy, they could just play it on Hard. I am sure that there are lots of very good players who would not find it too hard, but there are alot of average players like me who do.

On MODERATE, I made over 50 villagers, but then it turns out that my population limit is 110. I thought it was 200. It means that I shuld make just 27 villagers. I sent a wave of troops toward Constantinople, and two more west into southern Germany for the relics in those places, but they kept getting wiped out by troops. As the game progessed, the enemy churned out Teutonic knights. Actually, I had quite alot of resources, like 5000 gold, even after those waves, but the population limit made it so that I couldn't easily churn out a ton of troops at once. My army had like 25 people.

On STANDARD, I made 30 villagers and 4 siege engines and used the engines to smash the gate and the towers by the wall in Moldova. The coast was clear to the Town Center in Romania, so I sent in the rams with some support, but they got massacred by enemy archers and teutonic knights and ships.
I guess I need to build a castle and fire ships before attacking the Town Center... And I probably need to use like 50 soldiers or something to attack, but that is not good because you are supposed to attack early due to the Romans' superiority. Finally, I beat it on STANDARD.

SCENARIO #2 The Huns (5th Century AD)
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For Scenario 2, the map marked 117 AD is still used, where the arrows show the same invasion into Romania. As you progress through the Scenarios, the Campaign map shows the different locations where those Scenarios occur.
The Instructions say that you must kill the Red and Blue leaders, and that a third player supplies tributes/resources to the other two. I beat it on STANDARD.
[WALKTHROUGH SPOILER: The Red and Blue Players are in the middle and SW of the map. The Yellow player's villagers gathering resources are in the east corner, so you can first go north and then go clockwise along the edge of the map to get to the villagers to cut off the supplies going to red and blue. There is one spot in the northern part of the map where you need to chop wood a bit to clear a way for your horse archers to get through.]

SCENARIO #5.
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The instructions say to get the relic by the monastery in the Northeast, but in fact the monastery is in the northwest, like Vatican City is in relation to Rome.

A place for potential room for improvement in Scenario #5 is that it just uses the standard AOE2 medieval architecture. I would like to recommend that the Designer use some of the Italian-style updates in AOE2's DLCs (eg. the Forgotten), like the Italian civilization, and the Roman architecture (eg. aqueducts). An AOE2 Scenario that does a great job making a pretty map with a very Roman feel is "Colosseum" (Colosseum, https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=445429494&searchtext=rome) .

It surprised me how much its map of Rome looks like the one that I made for AOE1:ROR in my "Conversions and Catacombs" scenario. (http://aoe.heavengames.com/dl-php/showfile.php?fileid=2755) .
When I made my map I put in a cliff at the bottom to make a catacomb. I notice that the Designer's map has cliffs in the same area. Unless I was making a Scenario that needed the cliffs, I wouldn't put them there in a Rome map. Plus, users note that he took SpiritoftheLaw's map without acknowledging it. AOE1 maps can be transferred to AOE2. If he used mine, it's OK- imitation is a compliment in this case.