Constantinople, its empire increasingly harassed by Muslim…

The Empire had suffered two great losses during the 820s that destroyed their naval supremacy in the Mediterranean: the beginning of the Muslim conquest of Sicily and the fall of Crete to Andalusian exiles.

These losses had ushered an era where Saracen pirates raid the Christian northern shores of the Mediterranean almost at will.

The establishment of the Emirate of Crete, which has become a haven for Muslim ships, has opened the Aegean Sea up for raids, while their control—albeit partial—of Sicily has allowed the Arabs to raid and even settle in Italy and the Adriatic shores.

Several imperial attempts to retake Crete in the immediate aftermath of the Andalusian conquest, as well as a large-scale invasion in 842/843, had failed disastrously.

Constantinople thus tries a new approach in 852/853: it assembles a huge naval armament, reportedly of three fleets consisting of three hundred ships, and sends them to raid Muslim naval bases in the Eastern Mediterranean simultaneously.

One of these fleets, comprising eighty-five ships and five thousand men under a general known from Arab sources only as "Ibn Qatuna", heads for the Egyptian coast, for it is from Egypt that the Abbasids send aid to Crete.

The imperial fleet on May 22, 853 arrives before the city.

The garrison is absent at this time, attending a feast organized by the governor 'Anbasa ibn Ishaq al-Dabbi in Fustat.

Damietta's inhabitants flee the undefended city, which is plundered for two days, then torched by the invaders.

The imperial troops carry off some six hundred Arab and Coptic women, as well as large quantities of arms and other supplies intended for Crete.

They then sail east to attack the strong fortress of Ushtun and, after taking it, burn the many artillery and siege engines they find there and return home.

Although "one of the brightest military operations" (Christides) undertaken by the imperial Greek military, the raid is completely ignored in Byzantine sources, whose accounts are warped by their hostile attitude to Michael III and his reign.

As a consequence, the raid is known only through two Arab accounts, by al-Tabari and Ya'qubi.

According to the Arab chroniclers, the realization of Egypt's vulnerability from the sea led, after a long period of neglect, to the urgent strengthening of Egypt's maritime defenses: ships were constructed, new crews conscripted, and Damietta and other coastal sites fortified.

This marks the rebirth of the Egyptian navy, which will later reach its peak under the Fatimids.

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.