The second march—planned later, deliberate, and with lessons learned from the first—moved with a heavier emphasis on verification. Where earlier the party had been improvisational, now scientific intent sat at the center of logistics: measured bearings, repeated depth readings, triangulated sketches. Supplies were packed with an eye to accuracy as much as endurance; instruments were wrapped in oiled cloth and nested in chests that travelled on the backs of mules as if they were sacred cargo. The leader had returned with a claim that would be disputed on lecture platforms and in printed pamphlets back home, and the rest of the work had to be methodical to withstand skeptical scrutiny.
Night after night, camps were assembled beneath a ceiling of stars that burned with a clarity unfamiliar to men who had lived long under European haze. The heavens were a cold, impassive audience: constellations wheeled overhead, and the Milky Way ran like a pale river above a darker river on the ground. Fires were small and carefully tended to save fuel; their smoke curled into the cold, carrying with it the scents of boiled tea, damp leather, and the sharp acrid tang of insect repellents. A theodolite’s ticking—an instrument’s tiny mechanical heart—punctuated the dark hours, as precise and relentless as a metronome. Instruments passed between the leader and his companion under the pool of a handlamp; maps were unrolled on wooden boxes and re-ruled in ink that sometimes bled when a sudden gust sent raindrops across the paper. The air at night often carried a chill that crept into bones through wet clothing, making men wrap their blankets tighter and press their hands over coffee-thin cups of tea to ward off the shiver.
The trek itself moved through landscapes of keen contrast. One morning the party found the shore of the lake raked by wind; waves under a bruised sky ran in regular, impatient lines and slapped at basalt where the water had once heaved itself up against shore. At the northern margin, where the lake began to find its way out, spray hissed against rock faces and a salt freshness—more mineral than sea-scent—filled nostrils like a benediction after days of reek and rot. On other days the march ducked into reed beds whose whispering stalks hid mosquitoes that bit with a stubborn, ungovernable hunger; evenings there saw men scratching at ragged ankles and trading remedies in silence.
There were places of peril. The party threaded a marsh corridor where the underfoot surrendered to a sucking, treacherous mud. Mules floundered and sank with a wet, despairing sound; panniers slipped and crashed, and stores of tea, biscuit, and spare rope disappeared as if the ground had swallowed needs and comforts whole. Men stripped packs on the bank, wading in waist-deep to unroof panniers, and the work produced a chorus of wet sucking noises as weight was shifted and goods were thrown to drier ground. The smell was thick with rot and bog-sourness, and the air was heavy enough that breathing felt like drawing breath through cloth. Local carriers, the only people who moved across that sheet of danger with any economy, marked safe lines with poles and sang no songs to make it through; even they were subject to the season, which turned ordinary marsh into a place that tested wills as much as bodies.
The campaign collected data in a way that resembled careful construction rather than a single great revelation. The leader and his chosen assistant took repeated observations at the northern outlet: they paced distances and noted the breadth of a discharge, dropped weighted lines for depth readings, recorded the speed of flow by timing floats, and watched where the water thudded over basalt ledges and fell into narrower channels. The sensory aspect of these sites was immediate—roar and mist, the stinging chill of spray on exposed skin, the slick of fallen algae underfoot. Where the water tumbled, sound carried like surf across the plain; bearings taken at dawn when the air lay still were compared with those taken at dusk when wind hammered reeds into one-sided applause. These observations accumulated as scaffolding for the audacious claim that the lake fed a river that left it to the north; the claim was not a single moment but a house of repeated measures and corroborating patterns.
Tragedy threaded the campaign so tightly that sorrow became one of the expedition’s constant companions. Deaths came quietly, not in a single catastrophe but as a procession of small losses: a man taken by fever in the night, another lost to a wasting sickness that left him too weak to rise. Tents were emptied, possessions gathered into small, neat bundles, and burials were performed with the blunt efficiency of people who knew that to delay increased risk. The list of the dead was kept with the same meticulousness as the maps—names, dates, notes on symptoms—a ledger that turned personal grief into administrative fact. At times the party had to stop the work to tend the bereaved, to carry a body to a grave dug in hard ground, and to watch as the sun dropped and left the cemetery as a silhouette of absent men.
Violence also came in sudden, jagged episodes. An encounter with a local war party led to skirmish and flash of musket smoke across scrubland, the crack sharp and startling enough to send a white flock of birds skyward. After such incidents the tone of the camp changed; alertness hardened into a kind of militarized discipline. Men stitched new caution into their routines—keeping instruments within guarded tents, posting lookouts on rises, refusing routes that would leave them exposed to flanking attack. Yet even in fear there was a persistent thread of wonder: the falls offered a visual triumph that made the blood run freer for a moment, an emblem of discovery that seemed to justify the risks.
Heroism in this campaign was quiet and daily rather than theatrical. It showed in hands raw from hauling, in those who lent strength to a sick porter and carried his load another mile; it showed in the stubborn refusal to allow lost chronometers to invalidate an arc of measurements, in the patience of re-taking bearings when the sun was veiled. Equipment failed—chronometers ran slow in damp tents, leather-bound logs swelled and buckled, ink smeared in sudden showers—and each failure demanded improvisation: oiling rusted gear by candlelight, patching bindings with leather strips, re-sounding channels again and again. At times despair crept in: men weakened by hunger and cold, by chilblain and relentless fevers, hunched near fires scraping at thin soup. Yet determination returned just as often, in the tow-line of a mule hauled free from mud, in the steady hand that leveled an instrument for the nth bearing, in the silent nod of men who had seen the falls and would not unsee them.
The defining field-moment came at a rocky fall where the lake’s waters ran out over a shelf and narrowed into a river cutting north. There, the smell of fresh water mingled with stone; spray cooled the face, and the roar wrapped men in a cloak of sound that smothered doubts for an instant. Repeated measurements of elevation, careful noting of rock strata where water spilled and pooled, and corroborating testimony from those who knew the land led to the scientific conclusion that this fall marked a principal outflow feeding a river system directed northward—an observation that, if accepted, connected that inland sheet with the greater fluvial narrative of the region.
But confirmation was not without cost. Porters who had borne burdens for thousands of miles collapsed from exhaustion; a few were buried along the route under quick mounds and the indifferent sky. The leader understood the battle ahead: not merely the physical journey back to civilization, but the intellectual and reputational fight to persuade learned societies that his data, his methods, and his account could stand scrutiny. He now carried with him samples, sketches, and the fatigue of a campaign that had exacted its price in lives and in the quiet erosion of bodily endurance. The return would be a new kind of trial—of rhetoric, of publication, of defending every seam in his narrative—so that an observation made under spray and starlight might be recognized as accepted knowledge. The fieldwork had yielded what it set out to find; the work of making that finding endure was only beginning.