The Empire had suffered two great losses…

Constantinople, its empire increasingly harassed by Muslim raids, launches a major offensive against the ‘Abbasid caliphate in 851.

A land army pushes eastward through Anatolia to crush a Muslim army and take ten thousand prisoners in Amida (Diyarbakir), simultaneously landing an amphibious force in Egypt and sacking the city of Damietta in 853.

Godfrid Haraldsson’s Seine Campaign and the Winter Standoff (853–854)

After spending another winter in Denmark (852–853), Godfrid Haraldsson launches another Viking incursion into West Francia, continuing his strategy of attacking key Frankish river settlements. On October 9, 853, he sails up the Seine River, penetrating deep into Carolingian lands.

Godfrid’s Advance on the Seine (853)

• The Viking fleet sails past Rouen, an already vulnerable city that had been sacked in 841.
• The fleet advances as far as Pont-de-l’Arche, a strategic point controlling the river route to Paris.
• The Vikings encamp on an island near Les Andelys, establishing a defensive position from which they can raid surrounding lands.

Frankish Response: A Winter Standoff

• Charles the Bald calls for reinforcements, summoning his army as well as troops from the Middle Kingdom, ruled by Lothair II, Godfrid’s godfather.
• The Frankish forces march toward the Viking camp, but despite their numerical strength, they are unable to attack effectively.
• The problem:
  • The Frankish land army lacks boats to engage the Viking fleet, leaving them unable to dislodge the invaders from their island stronghold.
  • The Vikings, protected by the river and their fortified position, simply wait out the winter, raiding surrounding lands at will.
• The two sides face each other for the entire winter, locked in a frustrating deadlock.

The Significance of the 853–854 Standoff

• Frankish military limitations exposed → The inability to challenge Viking naval superiority highlights the Carolingians’ struggle to develop an effective river defense strategy.
• Viking strategy shifts toward prolonged occupation → Rather than seasonal raids, Norse leaders like Godfrid increasingly use fortified winter camps to maintain a long-term presence in Francia.
• A prelude to Viking territorial ambitions → This campaign foreshadows later Viking control over the lower Seine, which will eventually lead to the establishment of Normandy under Rollo in 911.

The winter standoff of 853–854 demonstrates that the Viking threat to West Francia is no longer just a series of raids, but a sustained military challenge that the Carolingians struggle to contain.

The Viking settlement of Dublin becomes a small kingdom in Ireland in 853.

The Moravian Prince Rastislav persuades Boris I to help him against East Francia in 854.

According to some sources, some Franks bribed the Bulgarian monarch to attack Louis the German.

The Bulgarian-Slav campaign is a disaster, and Louis scores a great victory and invades Bulgaria.

At the same time, the Pannonian Croats wage a war against the Bulgarians.

Both peoples had coexisted peacefully up to that time, suggesting that the Croats had been paid by Louis to attack Bulgaria and distract Boris' attention from his alliance with Great Moravia.

Boris cannot achieve any success, and both sides exchange gifts and settle for peace.

Taranto is in 854 again the base for an Arab raid, led by Abbas-ibn-Faid, …

…which sacks the Lombard province of Salerno.

The Stalemate on the Seine Ends: Godfrid’s Withdrawal (Spring 854)

After spending the winter of 853–854 encamped on an island near Les Andelys, Godfrid Haraldsson and his Viking fleet withdraw in the spring of 854, likely after receiving a tribute (Danegeld) from Charles the Bald.

The End of the Siege: A Likely Frankish Payout

• With Frankish land forces unable to attack due to their lack of boats, the Vikings remain secure throughout the winter.
• As spring arrives, Godfrid chooses to withdraw, suggesting that a negotiated settlement was reached.
• The Franks likely paid a tribute to persuade the Vikings to leave, as had been done in 845 after the sack of Paris.

Implications of the 854 Withdrawal

• A Pattern of Viking Tribute Payments → This marks another example of West Frankish kings opting to pay off the Vikings rather than engage in open battle.
• Continued Vulnerability of West Francia → The failure to repel the invasion without tribute further encourages Norse incursions, as it demonstrates the kingdom’s weakness.
• Foreshadowing Viking Settlements → The ability of Viking forces to winter unchallenged along the Seine lays the groundwork for future permanent Viking holdings, culminating in the creation of Normandy under Rollo in 911.

A Temporary Peace, Not an End to Viking Raids

Though Godfrid sails away, Viking attacks on West Francia’s river towns will continue, forcing Charles the Bald to seek new defensive strategies, including the construction of river forts and alliances with Viking leaders. However, the events of 853–854 highlight the Carolingian monarchy’s ongoing struggle to effectively counter the Viking threat.

King Horik I is killed in 854 by a nephew whom he had driven into exile.

While in exile, the nephew had become a successful raider.

Civil war ensues.

The peace between Bulgaria and Eastern Francia is restored as a result of the military actions in 855, and Rastislav is forced to fight against Louis alone.

The fifteen-year-old Emperor Michael, after quarreling with his mother, connives at the murder of Theoktistos by his maternal uncle Bardas in November 855.