Battle
Shift the crossing, dislocate the wings, survive the elephants
Military history
After concluding an alliance at Taxila, Alexander found on the far bank of the Hydaspes a king who refused to submit and could still await reinforcements. Porus did not have to win immediately: guarding the crossings and placing elephants before the cavalry was enough to block the campaign. Alexander therefore did not force the river opposite the camp. In Arrian, Plutarch, and Quintus Curtius, he made several days of alarms routine, divided his army, and concealed a night crossing upstream. The landed force still had to emerge from a secondary channel, defeat an advance guard described incompatibly by the authors, wait for its infantry, and then face Porus's line. Cavalry created two threats, but the centre did not yield mechanically: elephants crushed Macedonians, infantry evaded their charges, returned with missiles, and only closed shields after the animals were exhausted. The map reconstructs this sequence without fixing a battlefield that the Jhelum's ancient course can no longer be used to georeference.
Taxiles receives Alexander and supplies allies, but Porus rejects the demand to join the conqueror as a subject: Quintus Curtius has him answer that he will await Alexander at the frontier under arms. Diodorus adds hope of joining with Embisarus, who is still distant. Alexander has an interest in defeating Porus before that arrival; Porus can gain time behind the river without knowing where the real effort will fall.
Porus guards the camp sector and crossings judged practicable; above all, his elephants make it dangerous to bring horses ashore on a defended bank. Arrian describes high, turbid, swift water. Alexander then disperses the signals: boats, skins, cavalry, night cries, and the collection of provisions may announce an imminent crossing or a wait for low water. Porus's weariness is Arrian's framing, not a measurable mental state.
Arrian leaves Craterus at the main camp with conditional orders: cross only if Porus withdraws all his elephants, or if Alexander's victory becomes manifest. Other detachments between the camp and upstream point are to cross once the Paurava are engaged. The division maintains the threat on the bank but exposes Alexander's force to fighting before all columns have crossed.
The first Paurava response is commanded by a son of Porus in Arrian but by his brother Spitaces in Quintus Curtius; Plutarch gives 1,000 cavalry and 60 chariots without naming a commander, and Diodorus omits the crossing. The counts rise as high as 2,000 cavalry and 120 chariots. In Arrian, clay ground immobilising the chariots belongs to the skirmish; Quintus Curtius extends the mud more broadly. The map therefore separates the first contact from the firm, sandy ground Porus subsequently chooses in Arrian.
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Military history
V.8–10 : Taxila, refus de Poros, garde des passages et feintes ; V.11–13 : ordres conditionnels à Cratère, point boisé, île et bras profond ; V.14 : force avancée et variantes du premier contact ; V.15 : petite armée et quelques éléphants laissés au camp, distincts des 200 éléphants emmenés par Poros, puis ordre de bataille ; V.16–17 : cavalerie et combat des éléphants ; V.18–19 : pertes, sortie de Poros, règlement, Nicaea, Bucephala et mois Munychion
Principal narrative source for chronology, marching orders, formation states, and ancient figures; ancient but late, it is not a contemporary record.
View ↗§60.1–7 : surveillance, fausses alertes, nuit orageuse, île, second bras et traversée ; §60.8 : 1 000 cavaliers et 60 chars sans chef nommé ; §60.9–11 : Poros avance, Alexandre à gauche, Coenus à droite et combat jusqu’à la huitième heure ; §60.12–15 : Poros blessé, capture, traitement royal et territoire ajouté
Biographical tradition for the crossing, 1,000 cavalry and 60 chariots without a named commander, battle duration, capture of Porus, and addition of territories.
View ↗XVII.87.1 : bataille placée sous l’archonte Chremes ; XVII.87.2–5 : effectifs, attente d’Embisaros, cavalerie aux ailes, éléphants au front et infanterie dans les intervalles ; XVII.88.1–7 : chars, action des éléphants, Poros blessé qui s’effondre tandis que l’armée fuit ; XVII.89.1–6 : pertes, captifs, 80 éléphants, soins, rétablissement de Poros sur le pays qu’il gouvernait auparavant, sans agrandissement immédiat
Competing tradition for chronology, strengths, action of the elephants, losses, Porus's collapse, and restoration of his former kingdom; its figures and settlement are not combined with Arrian's.
View ↗Extrait Cambridge : les grandes lignes sont claires mais la tactique de cavalerie reste disputée et les ordres à Coenus sont le nœud du problème ; notes visibles 2 et 11–12 : absence d’appui textuel pour plusieurs reconstructions de la ligne ; notice bibliographique, p. 26–31
Dispute over the geometry of the mounted engagement and caution in reconstructing Coenus's manoeuvre.
View ↗PDF p. 7–8 / pagination de revue p. 713–714 : franchissement, début des pluies vers le milieu de l’été, chars, ligne d’éléphants, cavalerie arrière et durée du combat ; PDF p. 13–14 / pagination de revue p. 719–720 : discours et armes chez Quinte-Curce, motif du retournement des éléphants, contraste avec le va-et-vient d’Arrien
Modern synthesis on the role of elephants, rainy season, figures transmitted by Arrian, and limits of the ancient traditions.
View ↗VIII.13.1–28 : refus de Poros, dispositif de rive, îles, feintes, leurre royal, orage et passage ; VIII.14.1–10 : Spitacès, 3 000 cavaliers, 100 chars et sol boueux ; VIII.14.11–45 : déploiement, combat des éléphants, blessures et règlement avec Poros
Distinct Latin tradition concerning the advance guard's identity, figures, and elephant fighting; its speeches and spectacular details are not merged into Arrian.
View ↗p. 31–33 : problème ancien et absence de solution définitive ; p. 33–35 : déplacements du fleuve et méthode topographique ; p. 42–44 : hypothèse du camp vers Haranpur et du passage vers Jalalpur, pointe boisée, île et ravine ; p. 44–46 : impossibilité de fixer exactement le champ et Nicaea
Working hypothesis for the camp–crossing–terrain relationship and justification for a non-georeferenced map; no modern coordinate is presented as established.
View ↗PDF p. 46–52 : examen des récits de victoire, capture ou arrêt du combat et distinction entre résultat militaire et maintien de Poros ; p. 60–61 : campagne contre les Glausae et ajout ultérieur de leur territoire au royaume de Poros
Minority modern reading of the political significance: used to distinguish battlefield victory from a favourable settlement for Porus. Cancelling the military result attested by the sources would go beyond the documentary use adopted here.
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