From African Kaiser: General Paul von Lettow-Vorbeck and the Great War in Africa, 1914-1918, by Robert Gaudi (Caliber, 2017), Kindle Loc. 3843-3870:
The British blockade of German East Africa—challenged briefly by Königsberg before she hightailed it up the Rufiji—was nearly a complete success. Shortages of basic necessities made themselves painfully felt everywhere. The colonists soon lacked adequate supplies of soap, toothpaste, candles, fuel, beer, booze, rubber, cloth, chocolate, castor oil, and, most important, quinine, without which life in the tropics became impossible for Europeans. One or two blockade runners reached the Swahili Coast after many ha[r]dships—notably the Krönborg-Rubens and the Marie von Stettin—but these were heroic exceptions. The aim of any blockade—complete starvation of the enemy—seemed within reach of the British Royal Navy for the first few months of 1915.
Then, with the begrudging help of Governor Schnee, still stewing away at Morogoro, von Lettow organized the colony to produce some of the most needed items. German East Africa, rich in natural resources, mostly lacked the necessary infrastructure—factories, refineries, laboratories, warehouses—to turn these resources into commercial goods. But presently, the colonists took it upon themselves to manufacture a variety of products for both civilians and Schutztruppe—now reaching its peak popularity as patriotic enthusiasm, fueled by the victory at Tanga, swept the colony.
Planters’ wives revived the neglected art of spinning using native cotton; African women, given scratch-built looms, wove bolts of cloth. Between them, they more than made up for the lack of imported fabric. Leather torn from the backs of native buffalo herds and tanned using chemicals extracted from the colony’s plentiful mangrove trees got cobbled into the boots so critical for the Schutztruppe—soon to march unimaginable distances over rough landscapes, much of which could not be traversed barefoot. Candles materialized from tallow; rubber from tapped trees: carefully dripped along rope, the raw, milky stuff was then hand-kneaded into tires for GEA’s few automobiles, including von Lettow’s staff car. A kind of primitive, homemade gasoline called trebol powered these vehicles—it was a by-product of distillates of copra, which also yielded benzene and paraffin. Soap came from a combination of animal fat and coconut oil. Planters and small businessmen eventually produced 10,000 pounds of chocolate and cocoa and 3,000 bottles of castor oil. Meanwhile, new factories sprang up in Dar es Salaam to make nails and other metal goods, including some ammunition. Rope woven from pineapple fiber proved both durable and less susceptible to rot than hempen rope from Germany; cigars and cigarettes rolled from native-grown tobacco made their way into every soldier’s kit. At Morogoro and elsewhere, home brewers distilled schnapps and moonshine. The latter, at 98 proof and optimistically labeled “whiskey,” was issued to the troops as part of their basic rations.
All this ingenuity, however, would be rendered useless without quinine. Before the war, the colony had gotten its supply from distributors in the Dutch East Indies, now cut off by the blockade. Dwindling supplies meant European populations of the colony would have no defense against their greatest enemy—not the British or rebellious natives but the malaria-bearing anopheles mosquito. At von Lettow’s urging, the famous biological research center at Amani turned its chemists to developing a quinine substitute in their laboratories. The chemists researched furiously, tried formulations of this and that, and at last came up with an effective type of liquid quinine distilled from cinchona bark. Called “von Lettow schnapps” by his men, this foul-tasting, much-reviled elixir nevertheless met most of the army’s needs for the next year or so.