The Dahomey Slaves Rebellion 1893
To expand the strength of the Cameroon Polizeitruppe, Hauptmann von Gravenreuth bought slaves from the King of Dahomey in 1891. The idea was that the slaves could then earn their freedom and that of their families by five years of German service. Although the idea was a humane one in which the slaves ultimately became free, during their service in the Polizeitruppe they and their families were still slaves, unpaid, harshly treated and harshly punished. In December 1893, after having been forced to watch their wives being flogged for refusing to work, fifty of them rose up in mutiny, killing their commanders and occupying government buildings. Although the rebellion failed to catch on in other parts of the colony the mutineers resisted attempts to quell them. Ironically their German military training served them well. It was not until the gunboat SMS Hyäne under Kapitänleutnant Reincke along with other sailors based on ships in the area arrived that the rebellion could be crushed with sailors and shellfire from the ship. The remaining 29 mutineers were hanged and their families sent into hard labour.

The long term effects of this rebellion were felt throughout the colonies. The scandal of using slaves as police was revealed in Germany and became a national disgrace. It was one of a series of scandals in Cameroon which led to a lessening of the harshness and cruelty of colonial rule in Cameroon (and later in German East Africa and German South West Africa after the Maji-maji and Herero Rebellions respectively). Another effect of the slave rebellion was that the colonial authorities realised a Polizeitruppe was not enough to control Cameroon and formed the Cameroon Schutztruppe in 1894.
Recommended External Link - "Der Aufstand der Polizeisoldaten, Kamerun 1893" in the "Magazin" section of Traditionsverband

The First World War in German Cameroon 1914-16
The surrounding British and French colonies launched simultaneous invasions of Cameroon in August 1914. But hopes for a quick victory as in Togo were dashed by stiff German resistance along with raids and counter attacks as the invaders tried to advance through Cameroon's difficult terrain. The Germans and their forces abandoned Duala and other towns while fighting an armed retreat into the interior. It took months of tough campaigning across jungles, swamps and mountain ranges for the allies to bring the last outpost of the  Schutztruppe to a surrender on 18th February 1916. Even then, most of the Germans and African troops had already managed to evade capture by escaping to neighbouring neutral Spanish Muni territory, rather then surrender to the British, French and Belgians (the latter had joined in the campaign in its later phases).
Recommended External Link- Deutsche-kriegsgeschichte - Kamerun 1914-16

Police
The Cameroon police ("Polizeitruppe Kamerun") were first formed in 1889. As with most other colonial police forces it consisted of a few German police officers and African other ranks (recruited mainly from Serra Leone, Liberia, Togo and Dahomey). Initially they were considered sufficient to maintain law and order in the colony and accompany expeditions to the interior of the country. In fact it was a mutiny by Dahomey slaves within the Polizeitruppe in 1893 that was the biggest upheaval in law and order in the history of German Cameroon. As a result the Cameroon Schutztruppe was formed to back up the Polizeitruppe. Nevertheless the Polizeitruppe continued to expand as a paramilitary police force until the outbreak of the First World War when it was fully incorporated into the Schutztruppe. The 1914 peacetime strength of the German Cameroon Polizeitruppe was approximately 40 German Officers and NCOs and 1,225 African other ranks.

Marine Infantry
The Seebataillone, were also briefly deployed in Cameroon. A company sized unit with men from both the I. and II. Seebataillon were sent out to assist in the Dahomey Slaves Rebellion of 1893. They saw no action however as the rebellion had already been crushed before their arrival. They returned to Germany in early 1894.
Recommended External Link - Marine Infanterie

The First World War in Togo 1914
On the outbreak of War in Europe, the German deputy-governor Major Doering (deputising for Duke Adolf Friedrich of Mecklenburg-Schwerin) declared Togo to be neutral under the terms of the 1885 Treaty of Berlin. The British rejected this and led an invasion force from the South and West on August 6th 1914 (the first shot of the First World War by a British Imperial soldier was to have been fired here by Regimental Sergeant Major Alhaji Grunshi of the Gold Coast Regiment). A French force simultaneously invaded from the North. The Germans destroyed communication lines and fought several small delaying actions (the largest of which was at the River Chra on 22nd August) as they retreated into the interior to the radio station at Kamina but believing their defences to be unmaintainable, they destroyed the radio station and surrendered after a very short campaign on August 26th 1914.
Recommended External Link - Axis History Forum Discussion on the Battle of Kamina

Schutztruppe and Army
There was no Schutztruppe force in Togo, although individual regular army officers were seconded there by the colonial office to command the expeditions and give military training to the Polizeitruppe. These officers came under the control of the colonial office and therefore the overall Schutztruppe command.

Reservists
At the outbreak of the First World War Togo called up its German reservists to assist the police in the short lived defence. Approximately 200 Germans were formed into a separate unit called the European Company ("Europäer-Kompanie"). The Europäer-Kompanie was deployed at Kamina to defend the radio station there. The colony surrendered before the unit saw any action.

Navy
Despite being of strategic importance there was no permanent militarised naval presence in Togo. Neither were any naval battleships deployed there to support land actions.  The same non-military ships, separate from the Imperial navy, used by the colonial government of Cameroon also visited Togo and could potentially be used to ferry supplies and troops in times of war.