IMPERIUM ROMANUM

Book II · The Mediterranean Wars

Infographic · II-G04

THE ALPS PROFILE: Hannibal's Transverse and the Alpine Attrition (Autumn 218 BC)

THE ALPS PROFILE: Hannibal's Transverse and the Alpine Attrition (Autumn 218 BC)

Infographic II-G04: An elevation profile of the Alpine crossing (Autumn 218 BC), charting the physical ascent from the Rhône to the Po, the five historically contested passes, and the catastrophic two-thirds attrition anchored in the Lacinian bronze record.

DESIGN BRIEF: INFOGRAPHIC II-G04

"THE ALPS PROFILE"

1. Purpose & Analytical Objective

This media plate provides a technical elevation cross-section and operational tally of Hannibal Barca’s passage of the Alps in September–October 218 BC. Designed in the staff-history register of IMPERIUM ROMANUM, it reconstructs the physical ascent from the Rhône basin to the Alpine ridge and the steep descent into the Cisalpine plain. It serves three editorial requirements:

  1. The Spatial Architecture of the Ascent: Render the physical profile of the transverse, displaying the altitude bands (sea level to 3,000 meters), seasonal weather limits (early autumn snowline), and choke-points (Allobrogian ambushes, frozen defiles, rockfalls).
  2. The Debated-Pass Question: Present honestly, via parallel dotted trajectories, the five principal historical pass candidates without false certainty, noting the primary geochemical marker at the Col de la Traversette.
  3. Attestation-Graded Arithmetic: Track the progressive drawdown of Hannibal’s army by stage, anchoring the terminal figures in the epigraphic baseline of the bronze inscription at the Lacinian promontory cited by Polybius.

2. Panel Layout & Structural Zones

A. Upper Register: Cartouche & The Geographic Crest (3,000m to 1,800m)

  • Elevation Grid: Vertical axis running on left and right margins, marked in increments: 0 m, 500 m, 1,000 m, 1,500 m, 2,000 m, 2,500 m, 3,000 m.
  • The Ridge Profile: A stark, continuous geological cross-section silhouette in iron-grey (#4A4E51) with fine hachuring, rising from the Rhône basin (c. 150 m) through the lower sub-Alpine gorges to the main continental watershed.
  • The Diverging Summit Routes (The Debated Passes): Approaching the summit zone (2,000–3,000 m), the single march route splits into five dashed/dotted survey paths:
    1. COL DE LA TRAVERSETTE (2,947 M) — Highlighted with a subtle gold marker flag: [A] GEOCHEMICAL BIO-MARKER (MAHANEY 2016).
    2. COL DE CLAPIER (2,490 M) — Dotted survey path.
    3. COL DU MONT-CENIS (2,081 M) — Dotted survey path.
    4. COL DU PETIT SAINT-BERNARD (2,188 M) — Dotted survey path.
    5. COL DE LARCHE (1,991 M) — Dotted survey path.
  • Climatic Boundary: An Aegean-blue tinted zone (#A4C2D9) at c. 2,200 M labeled: NIX RECENS · THE AUTUMN SNOWLINE (SEPT–OCT 218 BC).

B. Central Register: Operational Episodes & Choke Points

  • Station I (Rhône Crossing / Lower Valley): Labeled RHODANUS TRANSITUS (c. 150 M). Callout: ALL XXXVII ELEPHANTS CONVEYED ON TURFED RAFTS [GRADE B].
  • Station II (Foothill Defiles): Labeled GORGE OF THE ALLOBROGES (c. 800–1,200 M). Callout: TRIBAL AMBUSH FROM HEIGHTS; COLUMN COMPRESSION & PACK-TRAIN LOSSES [GRADE B].
  • Station III (High Pass Obstruction): Labeled THE FRACTURED TRACK (c. 2,600 M). Callout: RUPES IGNI ET ACETO FRACTA · 3-DAY PASSAGE CUT THROUGH ROCKFALL VIA HEATING & THERMAL SHOCK [GRADE B].
  • Station IV (Descent & Plain Landfall): Labeled PADUS BASIN / TERRITORY OF THE INSUBRES (c. 120 M). Callout: EMERGENCE INTO CISALPINE GAUL; ALLIANCE WITH BOII & INSUBRES [GRADE A].

C. Lower Register: The Arithmetic of Attrition (Data Ledger Strip)

A horizontal tracking ledger aligned directly beneath the elevation profile, dividing the march into four quantitative tally-blocks:

  1. Departure from Carthago Nova (Spring 218 BC):
    • INFANTRY: 90,000 [AGrade A, Lacinian Inscription]
    • CAVALRY: 12,000 [AGrade A, Lacinian Inscription]
    • WAR ELEPHANTS: 37 [BGrade B]
    • Note: c. 22,000 detached to Spain & Pyrenean defense
  2. Rhône Passage (August 218 BC):
    • INFANTRY: c. 38,000–46,000 [BGrade B]
    • CAVALRY: c. 8,000–10,000 [BGrade B]
    • WAR ELEPHANTS: 37 [BGrade B, Polybius 3.46]
  3. Alpine Transit Loss (September–October 218 BC):
    • ESTIMATED LOSS TO DESERTION, COMBAT, EXPOSURE & PRECIPICE: c. 20,000–26,000 COMBATANTS [BGrade B, Tradition's Calculus]
    • ELEPHANTS LOST IN TRANSIT: c. 17 [BGrade B]
  4. Arrival in Italy (November 218 BC):
    • INFANTRY: 20,000 (12,000 LIBYAN · 8,000 IBERIAN) [AGrade A, Lacinian Inscription via Polybius 3.56]
    • CAVALRY: 6,000 (NUMIDIAN & IBERIAN) [AGrade A, Lacinian Inscription]
    • SURVIVING WAR ELEPHANTS: c. 20 [BGrade B]
    • Editorial Thesis: TWO-THIRDS OF THE FIELD FORCE EXPENDED TO SEIZE THE STRATEGIC INITIATIVE.

3. Palette & Typography Specifications

  • Ground: Cream (#F4EBD5).
  • Borders & Rules: Terracotta (#A85638) framing border with double hairline inner rules.
  • Titling & Cartouches: Gold (#B89954) cartouche plates with black serif titling.
  • Carthaginian March Route & Data: Punic Ochre (#B5824A).
  • Terrain & Geology: Iron-grey (#4A4E51) hachuring and solid silhouettes.
  • Hydrology & Glacial Zones: Pale Aegean blue (#A4C2D9).
  • Roman Threat / Strategic Context: Roman Crimson (#8B1A1A).
  • Typography: Conservative, classical serif lettering (Roman inscriptional capitals for titles; small caps for sub-headers and technical callouts; tabular figures for all data ledgers).

Image prompt (16:9)

A technical military-historical elevation cross-section infographic in the staff-history register: THE ALPS PROFILE, AUTUMN 218 BC, rendered on a warm cream (#F4EBD5) ground with a terracotta (#A85638) structural frame and gold (#B89954) cartouches. The main graphic is an accurate lateral mountain cross-section in iron-grey (#4A4E51) rising from the Rhône river valley at left (150 meters) up through craggy Alpine ridges to a high pass crest (nearly 3,000 meters) and dropping steeply into the Po valley at right (120 meters). Vertical elevation scale on both margins marked in meters from 0 to 3,000. Above 2,200 meters, an Aegean-blue (#A4C2D9) wash indicates fresh autumn snow, labeled 'NIX RECENS · THE AUTUMN SNOWLINE'. The main Carthaginian march route is drawn as a solid Punic-ochre (#B5824A) line ascending the slope. Near the summit, the route branches into five parallel dashed survey lines indicating the debated passes: 'COL DE LA TRAVERSETTE (2,947 M)' with a gold marker flag '[A]', 'COL DE CLAPIER (2,490 M)', 'COL DU MONT-CENIS (2,081 M)', 'COL DU PETIT SAINT-BERNARD (2,188 M)', and 'COL DE LARCHE (1,991 M)'. Four annotated operational stations appear along the ascent: 'RHODANUS TRANSITUS (c. 150 M) · XXXVII ELEPHANTI TRADUCTI', 'ALLOBROGUM INSIDIAE (c. 1,000 M)', 'RUPES IGNI ET ACETO FRACTA (c. 2,600 M)', and 'DESCENT TO THE INSUBRES (c. 120 M)'. Across the bottom runs a four-part horizontal data ledger in clean serif typography showing stage-by-stage manpower tallies: 'CARTHAGO NOVA: XC MILIA PED · XII MILIA EQ [A]', 'RHODANUS: c. XLVI MILIA PED · X MILIA EQ [B]', 'TRANSIT LOSS: c. XX–XXVI MILIA COMBATANTS [B]', and 'ITALIA: XX MILIA PED (XII M LIBYES · VIII M IBERI) · VI MILIA EQ · c. XX ELEPHANTI [A: ARA LACINIA]'. Clean architectural drafting style, no pictorial or illustrative human figures, precise staff-college cartographic linework.

II-G04 · generated by the Imperium factory studio (gemini-3.8-flash) from Book II under the House Preamble.