AHC: England invades the HRE or vice versa between 962 and 1500

962? That's Saxon England next to impossible.

1500? Maybe the HRE supports a weakened France in the Hundred Years' War they launch some sort raid through Aquitaine.

I'm not an expert on Medieval logistics or sea warfare by any means but a complex modern invasion simply wasn't possible at the time.
 

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Repeat the Anglo-Saxon migration. England (instead of Roman Britannia) falls into disarray, German knights (instead of Anglo-Saxon pirates and warriors) come in to restore order and become the ruling and military class.
 
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how could this have happened?
Canute's dynastic union continues with a secure succession. With a border between Denmark and the HRE and the complications of competing claims in northern Germany/southern Denmark a war could easily occur between the HRE and the Union.
second option for some reason the Emperor responds positively to a request for support from the Empress Matilda and intervenes to support her against Stephen.
On the hundred years war option, that could possibly happen if Burgundy is much more solidly and consistently aligned with England, leading to greater English/Burgundian success, which in turn leads to Burgundy threatening the HRE's possessions on the Rhine, and/or interests in the low countries, thus dragging England into conflict with the HRE..
 
Mary of Burgundy doesn't die in 1482, so Maximilian isn't bogged down in a struggle to enforce his authority in the Netherlands.

When Richard III seizes power in England, Max invades in support of Buckingham's rebellion, and then clams the throne for himself, as both he and Mary are descended from John of Gaunt.
 
Mary of Burgundy doesn't die in 1482, so Maximilian isn't bogged down in a struggle to enforce his authority in the Netherlands.

When Richard III seizes power in England, Max invades in support of Buckingham's rebellion, and then clams the throne for himself, as both he and Mary are descended from John of Gaunt.

Further thought. The same result might ensue if Edward IV died 13 months earlier, ie just before Mary. The receipt of that news might cause enough butterflies to prevent the riding accident which caused her death OTL.
 
England holds and expands it's possessions in France. Whichever king comes along in whichever year and job done.
 
If you just want english armies to fight in the hre, that's otl. Edward the confessor sent a fleet against baldwin of flanders in 1049 and the despenser's crusade of 1382-83 also took place in flanders.

If you want an english invasion of somewhere in the reich that isn't flanders then Lubeck is your best bet. The hanseatic league declared war on england in 1469 and harssased their shipping for 5 years until the english crown gave in.

A fleet being sent to burn lubeck in response is possible if england could gather enough ships.
 
Can the King of England be also the Prince-Elector of Saxony and accumulate various fiefdoms through weddings and become powerful enough to be elected Emperor and cause an alternate hundred years War which would be a Civil War of the Holy Roman Empire, In short instead of the king of England having possessions in france it will have in germany and will not be vassal of the king France like OTL but he will be vassal of the Emperor.
 
In 1425 Duke Humphrey of Gloucester claimed the County of Hainaut, Holland and Zeeland by right of his wife and invaded the land, and the county was technically part of the HRE, so...
 
?? The Normans managed it, and the English sent troops across the Channel.

Yeah, exactly. Just in the first hundred years after 962, England was invaded like 5 times. The two Danish kings Cnut and Sweyn conquered it, William conquered it, Harald of Norway and sweyn of Denmark both launched unsuccessful invasions.

It's probably the time period where England is most vulnerable for an attack from the continent, not the least.
 
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