"Al-Jamasi Notebook".. The Secret of the Egyptian "Zero Hour" in the October War

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Despite the passage of 53 years since the October War, the timing of its launch, specifically at two minutes past two in the afternoon, continues to intrigue researchers and historians, as it is considered one of the most prominent details in the planning of the battle.

The choice of "zero hour" was not a random temporal decision; rather, it resulted from precise military, astronomical, geographical, and field calculations aimed at achieving the greatest possible surprise and providing suitable conditions for the crossing operation.

The Egyptian airstrike was launched, followed by the crossing of the canal and the storming of the Bar Lev Line, at a timing that confused Israeli intelligence and deviated from the usual military doctrines, forming the first appearance of strategic surprise.

The behind-the-scenes choice of this timing is associated with the name of Marshal Mohamed Abdel Ghani El Gamasy, the head of the Armed Forces Operations Authority at the time, who prepared a historical study commissioned by the General Command.

The Egyptian General Authority for Information documents the connection of El-Gamsy to the preparation of the crossing plan, known as "El-Gamsy's Notebook," and the Egyptian Ministry of Defense provides, among the documents of the October War, the memoirs of Marshal El-Gamsy in his own handwriting.

This study was handwritten in a notebook presented to the late Egyptian President Anwar Sadat, affectionately named "El-Gamsy's Notebook," which includes not only a proposal for the timing of the attack but also a comprehensive scientific study that included a precise observation of the months, days, and hours of the year 1973.

The study also included the movement of tides and current speed, by studying the hours when the water current in the Suez Canal was at its lowest, to facilitate the crossing of rubber boats and the construction of water bridges. The General Authority for Information confirms that the timing of the attack indeed considered the state of the tides, current speed, and direction, in addition to other factors related to battlefield and weather conditions.

It also addressed the state of the moon and lighting, as days were chosen when the moon was bright in its first half, to provide natural lighting that would help military engineers open gaps in the water and establish bridges at night, before the moon disappeared in the second half, bringing darkness to protect the bridges from Israeli air raids.

The calculations extended to Israeli holidays and vacations, where the choice settled on the day of "Yom Kippur" (Day of Atonement), which is the day when media, transportation, and civilian communication networks in Israel come to a halt, causing confusion in the Israeli army's general mobilization network and the calling up of reserve forces. From this day, the Israeli war was named the "Yom Kippur War."

In this context, traditional military tactics require that major attacks usually begin at "first light" (dawn) or "last light" (dusk), while the joint Egyptian-Syrian planning broke this pattern and overcame the obstacle of conflicting field interests between the two fronts.

The Syrian front preferred to attack at dawn, so that the light would be in favor of its advancing forces westward towards the Golan Heights, while the Egyptian front preferred to attack at dusk, to set up heavy bridges under the cover of night, away from the eyes of Israeli aircraft.

Thus, the time 2:05 PM came as a compromise that achieved the common interest; it provided the Syrian forces with enough light to advance and granted the Egyptian forces about 3 hours of light to complete the airstrike, the fire preparation, and the crossing of the first infantry, followed immediately by the onset of night, which allowed the military engineers to begin building the bridges and securing the bridgeheads in darkness that prevented Israeli aircraft from targeting them.

In addition, the position of the sun played a crucial role; at noon, the sun begins to tilt towards the west and cast its rays, placing it behind the advancing Egyptian forces to the east, while its direct rays fell into the eyes of the Israelis fortified at the Bar Lev Line on the eastern bank, hindering their direct vision while responding to the first waves.

It is worth noting that at 2:05 PM, more than 200 Egyptian fighter jets took off at low altitude to strike air bases, command centers, radar stations, and fortifications of Israeli forces deep in Sinai.

A few minutes later, specifically at 2:10 PM, the artillery preparation began with a massive bombardment involving more than 2000 cannons along the canal front, unleashing their fire on the fortifications of the Bar Lev Line.

Later, at 2:20 PM, the first waves of infantry surged across in rubber boats under the cover of artillery, raising Egyptian flags, and then the water pumps began to operate to open breaches in the earthen barrier.

Data from the General Command of the Egyptian Armed Forces documents that the Egyptian forces stormed the Suez Canal under the cover of air and artillery bombardment, successfully crossing the canal and seizing most of the eastern shore, then continuing to fight to reinforce their positions east of the canal.

As evening approached, heavy bridges were being assembled and ferries were put into operation to facilitate the flow of tanks, armored vehicles, and heavy equipment, which helped to secure the bridgeheads east of the canal.

Thus, the "2 PM" was not just a passing time detail, but the direct result of a complex military and intelligence planning process, where numbers and astronomical calculations in the "Jumsi Notebook" transformed into a starting point for one of the greatest crossing operations and strategic changes in contemporary military history.