Methodology

Environmental History and Military History

DANFront adopts the conceptual approach of environmental history to analyze Ottoman military progress along the Lower and Middle Danube. The ultimate benefit of applying the analytical tools and framework of environmental history to the study of the Ottoman Danube is that through such research, we gain a broader understanding of the river and of its role in shaping the Ottoman military's complex relationship to its natural environment. In this respect, the project combines the environmental and military histories of the Ottoman Danube with the region's political, social, and economic histories, offering a new interpretation of this frontier zone.

Digital Humanities

DANFront uses digital humanities mapping tools because they enable us to tell more complex stories through maps by adding layers, filters, pop-ups, and annotations. The digital humanities also enable qualitative and quantitative analysis of GIS data to gain complex understandings of spaces. Finally, the digital humanities help us recognize the social constructions of place, rethink the power structures that have historically been part of cartography, and reimagine how we tell stories.

In the project, we first extract data on fortresses, garrisons, and other fluvial infrastructure (shipyards, bridges, mills, etc.), as well as data on floods, icing, alluvial deposits, and other riverine features from a range of primary and secondary sources (Sources). Second, we transcribe extracted historical data into datasets (in the form of spreadsheets and charts) (Database).

An excerpt from the dataset, listing the Ottoman garrisons in the Budin province

Third, we integrate them into interactive maps (Maps) using Geographical Information Systems (GIS). Researchers can navigate, analyze, download, and use our data, as it is open access.

An excerpt showing the mapping of garrisons, using QGIS

In the project, we also visualize the datasets graphically (Visualizations). By providing visual representations of historical data, we aim to enable a range of cross-analyses, thereby transcending conventional avenues of inquiry.

Garrisons

This project adopts a data-driven institutional approach to the study of Ottoman frontier garrisons. Rather than treating military titles as fixed categories, it analyzes their functional roles within specific archival contexts. By systematically extracting personnel data from pay registers, tax surveys, and imperial council registers, supplementary and secondary sources the project reconstructs the organizational structure of fortress garrisons along the Danube frontier.

Military units are categorized into analytically comparable groups (infantry, cavalry, artillery, auxiliary, and service personnel) in order to identify structural patterns across different fortresses and periods. However, in several registers certain units were recorded jointly (e.g., müstahfızan and topçu). Such entries reflect administrative bookkeeping practices rather than operational uniformity. Instead of artificially redistributing these personnel into separate categories, they are treated as composite units in the dataset. This preserves the integrity of the archival record while maintaining analytical transparency.

This approach enables a reassessment of the Ottoman frontier not as a vague borderland, but as a structured administrative-military governance system.

Identifying and Assessing Flood Events

Floods along the Danube were not caused solely by precipitation. In addition to heavy rainfall, several natural factors could trigger flooding. These included:

• The thawing of ice on frozen rivers
• The accumulation of alluvial deposits from previous floods
• The build-up of driftwood and other debris in the river channel

Alongside these natural dynamics, human interventions — such as the construction of mills and other fluvial infrastructure — could also alter water flow and contribute to flooding.

In the Ottoman sources, it is not always possible to identify explicit statements about the causes of floods. However, indirect inferences can be made by considering:

• The seasonal timing of events
• References to ice, driftwood, or debris
• Mentions of damaged mills, bridges, or embankments
• Repeated flooding in the same locations

To evaluate the intensity of flood events, this project applies the methodology developed by Christian Rohr in his study of the Traun River. (Christian Rohr (2006), "Measuring the frequency and intensity of floods of the Traun River (Upper Austria), 1441–1574," Hydrological Sciences Journal 51: 834–847.)

Rohr classifies floods into four intensity categories:

In this project, flood intensity is assessed based on:

• The scale of reported material damage
• The type of infrastructure affected (mills, bridges, fortifications, settlements)
• The duration and scale of reconstruction efforts
• The terminology used in the sources (e.g., expressions indicating devastation or disaster)

Although Ottoman records rarely provide quantitative measurements, applying Rohr's structured typology allows for:

• Systematic comparison across different flood events
• Integration into a digital dataset
• Visual representation in GIS-based mapping

This approach enables a comparative environmental analysis despite the qualitative nature of the sources.

Glossary